115 (one hundred [and] fifteen) is the natural number following 114 and preceding 116.
115 has a square sum of divisors:
There are 115 different rooted trees with exactly eight nodes, 115 inequivalent ways of placing six rooks on a 6 × 6 chess board in such a way that no two of the rooks attack each other, and 115 solutions to the stamp folding problem for a strip of seven rectangular stamps.
115 is also a heptagonal pyramidal number. The 115th Woodall number,
is a prime number. 115 is the sum of the first five heptagonal numbers.