One hundred nine

One hundred nine (also One hundred and nine) (109, CIX) is the natural number following one hundred eight and preceding one hundred ten. It is the 29nd prime number. The previous prime is one hundred seven, with which it comprises a twin prime.

One hundred nine is also:

• The atomic number of meitnerium.
• The registry number of the famous patrol boat PT-109, commanded by John F. Kennedy.

This article is about the number. For the year AD 109, see 109.