110 is a sphenic number and a pronic number.^[1] Following the prime quadruplet (101, 103, 107, 109), at 110, the Mertens function reaches a low of −5.

110 is the sum of three consecutive squares, ${\displaystyle 110=5^{2}+6^{2}+7^{2}}$ .

RSA-110 is one of the RSA numbers, large semiprimes that are part of the RSA Factoring Challenge.

In base 10, the number 110 is a Harshad number^[2] and a self number.^[3]

• The atomic number of darmstadtium.

• According to the Bible, the figures Joseph^[4][5] and Joshua^[6][7] both died aged 110.

Olympic male track and field athletics run 110 metre hurdles. (Female athletes run the 100 metre hurdles instead.)

The International 110, or the 110, is a one-design racing sailboat designed in 1939 by C. Raymond Hunt.

110 is also:

• The year AD 110 or 110 BC
• A common name for mains electricity in North America, despite the nominal voltage actually being 120 V (range 110–120 V). Normally spoken as "one-ten".
• 1-1-0, the emergency telephone number used to reach police services in Iran, Germany, Estonia, China, Indonesia, and Japan. Also used to reach the fire and rescue services in Norway and Turkey.
• The age a person must attain in order to be considered a supercentenarian.
• A card game related to Forty-five (card game).
• A percentage in the expression "To give 110%", meaning to give a little more effort than one's maximum effort
• The number of stories of each of the towers of the former World Trade Center in New York.
• The number of stories (by common reckoning) of the Sears Tower in Chicago.
• The TCP port used for POP3 email protocol
• A 110 block is a type of punch block used to connect sets of wires in a structured cabling system.
• The abjad (ابجد) translation of word "علی" (Ali) in Arabic and Persian.
• It is also known as "eleventy", a term made famous by linguist and author J. R. R. Tolkien (Bilbo Baggins celebrates his eleventy-first birthday at the beginning of The Lord of the Rings) and derived from the Old English hund endleofantig.^[8] When the word eleventy is used, it may indicate the exact number (110), or more commonly an indefinite large number such as gazillion.
• Eleventy is used in the comic reading of a phone number in the Irish TV series "The Savage Eye" by Dave McSavage playing an opiate user advertising life insurance.
• Lowest number to not be considered a favorite by anyone among 44,000 people surveyed in a 2014 online poll^[9] and subsequently adopted by British television show QI as the show's favourite number in 2017.

• 110s decade
• List of highways numbered 110
• List of 110th Street, New York City Subway stations
• 110 film