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## Summary

1,000,000,000 (one billion, short scale; one thousand million or one milliard, one yard, 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.

1000000000
CardinalOne billion (short scale)
One thousand million, or one milliard (long scale)
OrdinalOne billionth (short scale)
Factorization29 · 59
Greek numeral${\stackrel {\iota }{\mathrm {M} }}$ Roman numeralM
Binary1110111001101011001010000000002
Ternary21202002000210100013
Octal73465450008
Duodecimal23AA9385412

In standard form, it is written as 1 × 109. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is G.

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.

The term milliard can also be used to refer to 1,000,000,000; whereas "milliard" is rarely used in English, variations on this name often appear in other languages.

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. Visualization of powers of ten from one to 1 billion

## Sense of scale

The facts below give a sense of how large 1,000,000,000 (109) is in the context of time according to current scientific evidence:

### Time

• 109 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 109 minutes ago, the Roman Empire was flourishing and Christianity was emerging. (109 minutes is roughly 1,901 years.)
• About 109 hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (109 hours is roughly 114,080 years.)
• About 109 days ago, Australopithecus, an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (109 days is roughly 2.738 million years.)
• About 109 months ago, dinosaurs walked the Earth during the late Cretaceous. (109 months is roughly 83.3 million years.)
• About 109 years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth.
• About 109 decades ago, galaxies began to appear in the early Universe which was then 3.799 billion years old. (109 decades is exactly 10 billion years.)
• The universe is thought to be about 13.8 × 109 years old.

### Distance

• 109 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.
• 109 metres (called a gigametre) is almost three times the distance from the Earth to the Moon.
• 109 kilometres (called a terametre) is over six times the distance from the Earth to the Sun.

### Area

• 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.

### Volume

• 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 m3).
• A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.

### Weight

• Any object that weighs one billion kilograms (2.2×109 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.

### Nature

• 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, which covers almost 4,000 miles (6,400 km) of the Mediterranean coast.
• In 1804, the world population was one billion.

### Count

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.

## Selected 10-digit numbers (1,000,000,001–9,999,999,999)

### 1,000,000,001 to 1,999,999,999

• 1,000,000,007 = smallest prime number with 10 digits.
• 1,000,006,281 = smallest triangular number with 10 digits and the 44,721st triangular number.
• 1,000,014,129 = 316232, the smallest ten-digit square.
• 1,003,003,001 = 10013, palindromic cube
• 1,021,147,343 = 10073
• 1,023,456,789 = smallest number without repeating digits
• 1,024,192,512 = 10083
• 1,026,753,849 = 320432, the smallest pandigital square in base 10.
• 1,073,741,824 = 327682 = 10243 = 645 = 326 = 810 = 415 = 230
• 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.
• 1,134,903,170 = 45th Fibonacci number.
• 1,160,290,625 = 655
• 1,162,261,467 = 319
• 1,162,268,326 = Leyland number
• 1,173,741,824 = Leyland number
• 1,220,703,125 = 513
• 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 = 665
• 1,280,000,000 = 207
• 1,291,467,969 = 359372 = 10893 = 336
• 1,311,738,121 = 25th Pell number.
• 1,350,125,107 = 675
• 1,382,958,545 = 15th Bell number.
• 1,405,695,061 = Markov prime
• 1,406,818,759 = 30th Wedderburn–Etherington number.
• 1,427,647,786 – Population of the People's Republic of China in 2018.
• 1,453,933,568 = 685
• 1,475,789,056 = 384162 = 1964 = 148
• 1,528,823,808 = 11523
• 1,533,776,805 = pentagonal triangular number
• 1,544,804,416 = 393042 = 11563 = 346
• 1,564,031,349 = 695
• 1,631,432,881 = 403912, square triangular number
• 1,673,196,525 = Lowest common multiple of the odd integers from 1 to 25
• 1,680,700,000 = 705
• 1,787,109,376 = 1-automorphic number
• 1,801,088,541 = 217
• 1,804,229,351 = 715
• 1,836,311,903 = 46th Fibonacci number.
• 1,838,265,625 = 428752 = 12253 = 356
• 1,882,341,361 = The smallest prime whose reversal is a square triangular number (triangular of 57121).
• 1,934,917,632 = 725
• 1,996,813,914 = Leyland number
• 1,977,326,743 = 711
• 1,999,999,999 = the biggest number from 1,000,000,000 - 1,999,999,999

### 2,000,000,000 to 2,999,999,999

• 2,038,074,743 = 100,000,000th prime number
• 2,073,071,593 = 735
• 2,147,483,647 = 8th Mersenne prime, 3rd double Mersenne prime, and the largest signed 32-bit integer.
• 2,147,483,648 = 231
• 2,147,484,609 = Leyland number
• 2,176,782,336 = 466562 = 12963 = 2164 = 366 = 612
• 2,179,768,320 = Leyland number
• 2,214,502,422 = 6th primary pseudoperfect number.
• 2,219,006,624 = 745
• 2,222,222,222 = repdigit
• 2,357,947,691 = 13313 = 119
• 2,373,046,875 = 755
• 2,494,357,888 = 227
• 2,535,525,376 = 765
• 2,562,890,625 = 506252 = 2254 = 158
• 2,565,726,409 = 506532 = 13693 = 376
• 2,706,784,157 = 775
• 2,887,174,368 = 785
• 2,971,215,073 = 11th Fibonacci prime (47th Fibonacci number) and a Markov prime.

### 3,000,000,000 to 3,999,999,999

• 3,010,936,384 = 548722 = 14443 = 386
• 3,077,056,399 = 795
• 3,166,815,962 = 26th Pell number.
• 3,192,727,797 = 24th Motzkin number.
• 3,276,800,000 = 805
• 3,323,236,238 = 31st Wedderburn–Etherington number.
• 3,333,333,333 = repdigit
• 3,404,825,447 = 237
• 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 = 590492 = 2434 = 815 = 910 = 320
• 3,486,792,401 = Leyland number
• 3,518,743,761 = 593192 = 15213 = 396
• 3,707,398,432 = 825
• 3,939,040,643 = 835

### 4,000,000,000 to 4,999,999,999

• 4,096,000,000 = 640002 = 16003 = 406
• 4,182,119,424 = 845
• 4,294,967,291 = Largest prime 32-bit unsigned integer.
• 4,294,967,295 = Maximum 32-bit unsigned integer (FFFFFFFF16), perfect totient number, product of all known Fermat primes $F_{0}$  through $F_{4}$ .
• 4,294,967,296 = 655362 = 2564 = 168 = 416 = 232
• 4,294,967,297 = $F_{5}$ , the first composite Fermat number.
• 4,294,968,320 = Leyland number
• 4,295,032,832 = Leyland number
• 4,437,053,125 = 855
• 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 = 247
• 4,704,270,176 = 865
• 4,750,104,241 = 689212 = 16813 = 416
• 4,807,526,976 = 48th Fibonacci number.
• 4,984,209,207 = 875

### 5,000,000,000 to 5,999,999,999

• 5,159,780,352 = 17283 = 129 = 1,000,000,00012 AKA a great-great-great-gross (1,000,00012 great-grosses or 1,00012 great-great-grosses)
• 5,277,319,168 = 885
• 5,354,228,880 = superior highly composite number, smallest number divisible by all the numbers 1 through 24
• 5,489,031,744 = 740882 = 17643 = 426
• 5,555,555,555 = repdigit
• 5,584,059,449 = 895
• 5,784,634,181 = 13th alternating factorial.
• 5,904,900,000 = 905

### 7,000,000,000 to 7,999,999,999

• 7,007,009,909 = smallest number in base 10 to take 100 iterations to form a palindrome
• 7,256,313,856 = 851842 = 19363 = 446
• 7,339,040,224 = 945
• 7,464,000,000 = Estimated population of the Earth in 2016 according to Worldometers
• 7,645,370,045 = 27th Pell number.
• 7,737,809,375 = 955
• 7,777,777,777 = repdigit
• 7,778,742,049 = 49th Fibonacci number.
• 7,862,958,391 = 32nd Wedderburn–Etherington number.

### 8,000,000,000 to 8,999,999,999

• 8,031,810,176 = 267
• 8,153,726,976 = 965
• 8,212,890,625 = 1-automorphic number
• 8,303,765,625 = 911252 = 20253 = 456
• 8,587,340,257 = 975
• 8,589,869,056 = 6th perfect number.
• 8,589,934,592 = 20483 = 811 = 233
• 8,589,935,681 = Leyland prime
• 8,804,293,473 = Leyland number
• 8,888,888,888 = repdigit

### 9,000,000,000 to 9,999,999,999

• 9,039,207,968 = 985
• 9,043,402,501 = 25th Motzkin number.
• 9,393,931,000 = 21103
• 9,474,296,896 = 973362 = 21163 = 466
• 9,509,900,499 = 995
• 9,814,072,356 = 990662, the largest pandigital square, largest pandigital pure power.
• 9,876,543,210 = largest number without repeated digits in base 10.
• 9,999,800,001 = 999992, the largest ten-digit square.
• 9,999,999,967 = greatest prime number with 10 digits
• 9,999,999,999 = largest 10-digit number, repdigit