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'109' is the natural number following 108 and preceding 110.

Cardinal	one hundred [and] nine
Ordinal	109th
Factorization	$prime$
Roman numeral	CIX
Binary	1101101
Hexadecimal	6D

Contents

In mathematics

In other fields

In mathematics

'One hundred [and] nine' is the 29th prime number, and also a Chen prime. The previous prime is 107, making them both twin primes. 109 is a centered triangular number. 109 is the smallest number which is palindromic in bases 5 and 9.

In other fields

'109' is also:

★ The atomic number of meitnerium.

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

★ The year AD 109 or 109 BC.

★ The Messerschmitt Bf 109 was a World War II fighter

★ The 109 Department Store in Shibuya, Tokyo