111

111 = 3 x 37.

111 is the smallest palindromic number such that the sum of its digits is one of its prime factors.

111 is a number that cannot be written as a sum of three squares.

A six-by-six magic square using the numbers 1 through 36 has a magic constant of 111.


111 would be the magic constant for the smallest magic square composed only of prime numbers if one were counted as a prime.


In J.R.R. Tolkien’s The Lord of the Rings, Bilbo Baggins disappears from his eleventy-first (111th) birthday party and from the Shire.

Sources: Number Gossip