113 is the natural number following 112 and preceding 114.

One hundred thirteen is the 30th prime number, following one hundred nine and preceding one hundred twenty-seven, a Sophie Germain prime and a permutable prime with 131 and 311. It is also a highly cototient number.

113 is a centered square number.

One hundred thirteen is also:

• The atomic number of an element temporarily called ununtrium.
• Part of an in-joke on some Disney movies. See A113.
• The number of surat al-Falaq in the Qur'an.
• The year AD 113 or 113 BC.