# One hundred five

**One hundred five** (also

**One hundred and five**) (105, CV) is the

natural number following

one hundred four and preceding

one hundred six. It is a

triangular number as well as a

composite number, with its divisors being 3, 5, 7, 15, 21 and 35, and its

factorization:

makes it a

sphenic number. This is one of the few odd numbers to be immediately surrounded on both sides by twin primes (101 and 103, below, and 107 and 109 above). The only other such odds less than a thousand are 15, 195 and 825. They are even rarer after that.

**One hundred five** is also:

This article is about the

number. For the year AD 105, see

105.