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**1,000,000,000** (one billion, short scale; one thousand million or one milliard, one yard,^{[1]} long scale) is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as **b**, **bil**^{[citation needed]} or **bn**.^{[2]}^{[3]}

1000000000 | |
---|---|

Cardinal | One billion (short scale) One thousand million, or one milliard (long scale) |

Ordinal | One billionth (short scale) |

Factorization | 2^{9} · 5^{9} |

Greek numeral | |

Roman numeral | M |

Binary | 111011100110101100101000000000_{2} |

Ternary | 2120200200021010001_{3} |

Octal | 7346545000_{8} |

Duodecimal | 23AA93854_{12} |

Hexadecimal | 3B9ACA00_{16} |

In standard form, it is written as **1 × 10 ^{9}**. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is

One billion years may be called an *eon* in astronomy or geology.

Previously in British English (but not in American English), the word "billion" referred exclusively to a million millions (1,000,000,000,000). However, this is no longer common, and the word has been used to mean one thousand million (1,000,000,000) for several decades.^{[4]}

The term * milliard* can also be used to refer to 1,000,000,000; whereas "milliard" is rarely used in English,

In the South Asian numbering system, it is known as 100 crore or 1 arab.

1,000,000,000 is also the cube of 1000.

The facts below give a sense of how large 1,000,000,000 (10^{9}) is in the context of time according to current scientific evidence:

- 10
^{9}seconds (1 gigasecond) equal 11,574 days, 1 hour, 46 minutes and 40 seconds (approximately 31.7 years, or 31 years, 8 months, 8 days). - About 10
^{9}minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10^{9}minutes is roughly 1,901 years.) - About 10
^{9}hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (10^{9}hours is roughly 114,080 years.) - About 10
^{9}days ago,*Australopithecus*, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (10^{9}days is roughly 2.738 million years.) - About 10
^{9}months ago, dinosaurs walked the Earth during the late Cretaceous. (10^{9}months is roughly 83.3 million years.) - About 10
^{9}years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth. - About 10
^{9}decades ago, galaxies began to appear in the early Universe which was then 3.799 billion years old. (10^{9}decades is exactly 10 billion years.) - The universe is thought to be about 13.8 × 10
^{9}years old.^{[6]}

- 10
^{9}inches is 15,783 miles (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point. - 10
^{9}metres (called a gigametre) is almost three times the distance from the Earth to the Moon. - 10
^{9}kilometres (called a terametre) is over six times the distance from the Earth to the Sun.

- A billion square inches could make a square about one half mile on a side.
- A bolt of finely woven 1000-TC bed sheet linen with a billion thread crossings would have an area of 40 square metres (48 sq yd), comparable to the floor area of a motel unit.

- There are one billion cubic millimetres in a cubic metre, and a billion cubic metres in a cubic kilometre.
- A billion grains of table salt or granulated sugar would occupy a volume of about 2.5 cubic feet (0.071 m
^{3}). - A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.

- Any object that weighs one billion kilograms (2.2×10
^{9}lb) would weigh about as much as 5,525 empty Boeing 747-400s. - A cube of iron that weighs one billion pounds (450,000,000 kg) would be 38.62 metres (126.7 ft) on each side.

- As of July 2016, Apple has sold one billion iPhones.
^{[7]}This makes the iPhone one of the most successful product lines in history, surpassing the PlayStation and the Rubik's Cube. - As of July 2016, Facebook has 1.71 billion users.
^{[8]}

- A small mountain, slightly larger than Stone Mountain in Georgia, United States, would weigh (have a mass of) a billion tons.
- There are billions of worker ants in the largest ant colony in the world,
^{[9]}which covers almost 4,000 miles (6,400 km) of the Mediterranean coast. - In 1804, the world population was one billion.

**A** is a cube; **B** consists of 1000 cubes the size of cube *A*, **C** consists of 1000 cubes the size of cube *B*; and **D** consists of 1000 cubes the size of cube *C*. Thus there are 1 million *A*-sized cubes in *C*; and 1,000,000,000 *A*-sized cubes in *D*.

**1,000,000,007**= smallest prime number with 10 digits.^{[10]}**1,000,006,281**= smallest triangular number with 10 digits and the 44,721st triangular number.**1,000,014,129**= 31623^{2}, the smallest ten-digit square.**1,003,003,001**= 1001^{3}, palindromic cube**1,021,147,343**= 1007^{3}**1,023,456,789**= smallest number without repeating digits**1,024,192,512**= 1008^{3}**1,026,753,849**= 32043^{2}, the smallest pandigital square in base 10.**1,073,741,824**= 32768^{2}= 1024^{3}= 64^{5}= 32^{6}= 8^{10}= 4^{15}= 2^{30}**1,073,742,724**= Leyland number**1,073,792,449**= Leyland number**1,111,111,111**= repunit, also a special number relating to the passing of Unix time.**1,129,760,415**= 23rd Motzkin number.^{[11]}**1,134,903,170**= 45th Fibonacci number.**1,160,290,625**= 65^{5}**1,162,261,467**= 3^{19}**1,162,268,326**= Leyland number**1,173,741,824**= Leyland number**1,220,703,125**= 5^{13}**1,221,074,418**= Leyland number**1,232,922,769**= Centered hexagonal number.**1,234,567,890**= pandigital number with the digits in order.**1,252,332,576**= 66^{5}**1,280,000,000**= 20^{7}**1,291,467,969**= 35937^{2}= 1089^{3}= 33^{6}**1,311,738,121**= 25th Pell number.^{[12]}**1,350,125,107**= 67^{5}**1,382,958,545**= 15th Bell number.^{[13]}**1,405,695,061**= Markov prime**1,406,818,759**= 30th Wedderburn–Etherington number.^{[14]}**1,427,647,786**– Population of the People's Republic of China in 2018.^{[15]}^{[16]}**1,453,933,568**= 68^{5}**1,475,789,056**= 38416^{2}= 196^{4}= 14^{8}**1,528,823,808**= 1152^{3}**1,533,776,805**= pentagonal triangular number**1,544,804,416**= 39304^{2}= 1156^{3}= 34^{6}**1,564,031,349**= 69^{5}**1,631,432,881**= 40391^{2}, square triangular number**1,673,196,525**= Lowest common multiple of the odd integers from 1 to 25**1,680,700,000**= 70^{5}**1,787,109,376**= 1-automorphic number^{[17]}**1,801,088,541**= 21^{7}**1,804,229,351**= 71^{5}**1,836,311,903**= 46th Fibonacci number.**1,838,265,625**= 42875^{2}= 1225^{3}= 35^{6}**1,882,341,361**= The smallest prime whose reversal is a square triangular number (triangular of 57121).**1,934,917,632**= 72^{5}**1,996,813,914**= Leyland number**1,977,326,743**= 7^{11}**1,999,999,999**= the biggest number from 1,000,000,000 - 1,999,999,999

**2,038,074,743**= 100,000,000th prime number**2,073,071,593**= 73^{5}**2,147,483,647**= 8th Mersenne prime, 3rd double Mersenne prime, and the largest signed 32-bit integer.**2,147,483,648**= 2^{31}**2,147,484,609**= Leyland number**2,176,782,336**= 46656^{2}= 1296^{3}= 216^{4}= 36^{6}= 6^{12}**2,179,768,320**= Leyland number**2,214,502,422**= 6th primary pseudoperfect number.^{[18]}**2,219,006,624**= 74^{5}**2,222,222,222**= repdigit**2,357,947,691**= 1331^{3}= 11^{9}**2,373,046,875**= 75^{5}**2,494,357,888**= 22^{7}**2,535,525,376**= 76^{5}**2,562,890,625**= 50625^{2}= 225^{4}= 15^{8}**2,565,726,409**= 50653^{2}= 1369^{3}= 37^{6}**2,706,784,157**= 77^{5}**2,887,174,368**= 78^{5}**2,971,215,073**= 11th Fibonacci prime (47th Fibonacci number) and a Markov prime.

**3,010,936,384**= 54872^{2}= 1444^{3}= 38^{6}**3,077,056,399**= 79^{5}**3,166,815,962**= 26th Pell number.^{[12]}**3,192,727,797**= 24th Motzkin number.^{[11]}**3,276,800,000**= 80^{5}**3,323,236,238**= 31st Wedderburn–Etherington number.^{[14]}**3,333,333,333**= repdigit**3,404,825,447**= 23^{7}**3,405,691,582**= hexadecimal CAFEBABE; used as a placeholder in programming.**3,405,697,037**= hexadecimal CAFED00D; used as a placeholder in programming.**3,486,784,401**= 59049^{2}= 243^{4}= 81^{5}= 9^{10}= 3^{20}**3,486,792,401**= Leyland number**3,518,743,761**= 59319^{2}= 1521^{3}= 39^{6}**3,707,398,432**= 82^{5}**3,735,928,559**= hexadecimal DEADBEEF; used as a placeholder in programming.**3,735,929,054**= hexadecimal DEADC0DE; used as a placeholder in programming.**3,939,040,643**= 83^{5}

**4,096,000,000**= 64000^{2}= 1600^{3}= 40^{6}**4,182,119,424**= 84^{5}**4,294,967,291**= Largest prime 32-bit unsigned integer.**4,294,967,295**= Maximum 32-bit unsigned integer (FFFFFFFF_{16}), perfect totient number, product of all known Fermat primes through .**4,294,967,296**= 65536^{2}= 256^{4}= 16^{8}= 4^{16}= 2^{32}**4,294,967,297**= , the first composite Fermat number.**4,294,968,320**= Leyland number**4,295,032,832**= Leyland number**4,437,053,125**= 85^{5}**4,444,444,444**= repdigit**4,486,784,401**= Leyland number**4,500,000,000**= Approximate age of the Earth in years**4,586,471,424**= 24^{7}**4,704,270,176**= 86^{5}**4,750,104,241**= 68921^{2}= 1681^{3}= 41^{6}**4,807,526,976**= 48th Fibonacci number.**4,984,209,207**= 87^{5}

**5,159,780,352**= 1728^{3}= 12^{9}= 1,000,000,000_{12}AKA a great-great-great-gross (1,000,000_{12}great-grosses or 1,000_{12}great-great-grosses)**5,277,319,168**= 88^{5}**5,354,228,880**= superior highly composite number, smallest number divisible by all the numbers 1 through 24**5,489,031,744**= 74088^{2}= 1764^{3}= 42^{6}**5,555,555,555**= repdigit**5,584,059,449**= 89^{5}**5,784,634,181**= 13th alternating factorial.^{[19]}**5,904,900,000**= 90^{5}

**6,103,515,625**= 78125^{2}= 25^{7}= 5^{14}**6,104,053,449**= Leyland number**6,210,001,000**= only self-descriptive number in base 10.**6,227,020,800**= 13!**6,240,321,451**= 91^{5}**6,321,363,049**= 79507^{2}= 1849^{3}= 43^{6}**6,469,693,230**= tenth primorial**6,590,815,232**= 92^{5}**6,666,666,666**= repdigit**6,956,883,693**= 93^{5}**6,975,757,441**= 83521^{2}= 289^{4}= 17^{8}**6,983,776,800**= 15th colossally abundant number,^{[20]}15th superior highly composite number^{[21]}

**7,007,009,909**= smallest number in base 10 to take 100 iterations to form a palindrome^{[22]}**7,256,313,856**= 85184^{2}= 1936^{3}= 44^{6}**7,339,040,224**= 94^{5}**7,464,000,000**= Estimated population of the Earth in 2016 according to Worldometers^{[23]}**7,645,370,045**= 27th Pell number.^{[12]}**7,737,809,375**= 95^{5}**7,777,777,777**= repdigit**7,778,742,049**= 49th Fibonacci number.**7,862,958,391**= 32nd Wedderburn–Etherington number.^{[14]}

**8,031,810,176**= 26^{7}**8,153,726,976**= 96^{5}**8,212,890,625**= 1-automorphic number^{[17]}**8,303,765,625**= 91125^{2}= 2025^{3}= 45^{6}**8,587,340,257**= 97^{5}**8,589,869,056**= 6th perfect number.^{[24]}**8,589,934,592**= 2048^{3}= 8^{11}= 2^{33}**8,589,935,681**= Leyland prime**8,804,293,473**= Leyland number**8,888,888,888**= repdigit

**9,039,207,968**= 98^{5}**9,043,402,501**= 25th Motzkin number.^{[11]}**9,393,931,000**= 2110^{3}**9,474,296,896**= 97336^{2}= 2116^{3}= 46^{6}**9,509,900,499**= 99^{5}**9,814,072,356**= 99066^{2}, the largest pandigital square, largest pandigital pure power.**9,876,543,210**= largest number without repeated digits in base 10.**9,999,800,001**= 99999^{2}, the largest ten-digit square.**9,999,999,967**= greatest prime number with 10 digits^{[25]}**9,999,999,999**= largest 10-digit number, repdigit

**^**"Yard".*Investopedia*. Retrieved 13 November 2017.**^**"figures".*The Economist Style Guide*(11th ed.). The Economist. 2015. ISBN 9781782830917.**^**"6.5 Abbreviating 'million' and 'billion'".*English Style Guide: A handbook for authors and translators in the European Commission*(PDF) (8th ed.). European Commission. 3 November 2017. p. 32.**^**"How many is a billion?".*OxfordDictionaries.com*. Retrieved 13 November 2017.**^**"billion,thousand million,milliard".*Google Ngram Viewer*. Retrieved 13 November 2017.**^**"Cosmic Detectives".*European Space Agency*. 2 April 2013.**^**Panken, Eli (27 July 2016). "Apple Announces It Has Sold One Billion iPhones".*NBCNews.com*. Retrieved 13 November 2017.**^**Seethamaram, Deep (27 July 2016). "Facebook Posts Strong Profit and Revenue Growth".*The Wall Street Journal*. Retrieved 13 November 2017.**^**Burke, Jeremy (16 June 2015). "How the World Became A Giant Ant Colony".*Atlas Obscura*. Retrieved 13 November 2017.**^**Sloane, N. J. A. (ed.). "Sequence A003617 (Smallest n-digit prime)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.- ^
^{a}^{b}^{c}Sloane, N. J. A. (ed.). "Sequence A001006 (Motzkin numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. - ^
^{a}^{b}^{c}Sloane, N. J. A. (ed.). "Sequence A000129 (Pell numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. **^**Sloane, N. J. A. (ed.). "Sequence A000110 (Bell or exponential numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.- ^
^{a}^{b}^{c}Sloane, N. J. A. (ed.). "Sequence A001190 (Wedderburn-Etherington numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. **^**""World Population prospects – Population division"".*population.un.org*. United Nations Department of Economic and Social Affairs, Population Division. Retrieved November 9, 2019.**^**""Overall total population" – World Population Prospects: The 2019 Revision" (xslx).*population.un.org*(custom data acquired via website). United Nations Department of Economic and Social Affairs, Population Division. Retrieved November 9, 2019.- ^
^{a}^{b}Sloane, N. J. A. (ed.). "Sequence A003226 (Automorphic numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2019-04-06. **^**Sloane, N. J. A. (ed.). "Sequence A054377 (Primary pseudoperfect numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.**^**Sloane, N. J. A. (ed.). "Sequence A005165 (Alternating factorials)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.**^**Sloane, N. J. A. (ed.). "Sequence A004490 (Colossally abundant numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.**^**Sloane, N. J. A. (ed.). "Sequence A002201 (Superior highly composite numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.**^**"Reversal-Addition Palindrome Test on 7007009909". July 9, 2021.**^**"World Population by Year". January 1, 2017.**^**Sloane, N. J. A. (ed.). "Sequence A000396 (Perfect numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.**^**"Greatest prime number with 10 digits".*Wolfram Alpha*. Retrieved 13 November 2017.