109 (number)

109 (number)

109 (one hundred [and] nine) is the natural number following 108 and preceding 110.

← 108
110 →
109
Cardinal one hundred [and] nine
Ordinal 109th
(one hundred [and] ninth)
Numeral system 109
Factorization prime
Prime 29th
Divisors 1, 109
Roman numeral CIX
Binary 11011012
Octal 1558
Duodecimal 9112
Hexadecimal 6D16

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 factor of one more than the product of the first twenty-three terms of the Euclid–Mullin sequence, making it the twenty-fourth term.

109 is the smallest number which is palindromic in bases 5 and 9.

The cycle of the decimal equivalent of 1/109 ends ...853211, the first six Fibonacci numbers in reversed order.

In other fields

109 is also:

See also

List of highways numbered 109


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