169 (number)

169 is the natural number following one hundred sixty-eight and preceding one hundred seventy.

169
Cardinal	one hundred and sixty-nine
Ordinal	169th
Factorization	$169 = 13^2$
Roman numeral	CLXIX
Binary	10101001
Hexadecimal	A9

One hundred sixty-nine is one of the few squares to also be a centered hexagonal number. But like any other odd square, it is also a centered octagonal number. It is a Pell number. It is the sum of seven consecutive primes, 13 + 17 + 19 + 23 + 29 + 31 + 37. It is the number of nonequivalent starting hands in Texas hold 'em (see http://www.math.sfu.ca/~alspach/art3.pdf for an explanation). See also one hundred sixty For the year AD, see 169 AD.

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