110 (number)

110 (one hundred [and] ten) is the natural number following 109 and preceding 111.

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 number² and a self number.³

110 is also:

• A percentage in the expression "To give 110%", meaning to give a little more effort than one's maximum effort
• Lowest number to not be considered a favourite by anyone among 44,000 people surveyed in a 2014 online poll⁴ and subsequently adopted by British television show QI as the show's favourite number in 2017.

Compare twelfty.

• One hundred and ten is also known as "eleventy", a term made famous in its ordinal form 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.⁵
• 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.

• Eleventy has also been used to mean an indefinite large number - "lots". Similarly eleventy-eleven was used in nineteenth century Mississippi in the same role.⁶