169 is the natural number following 168 and preceding 170.

Being 13 squared, 169 is one of the few squares to also be a centered hexagonal number. But like any other odd square, it is a centered octagonal number.

It is an odd-indexed Pell number, thus it's also a Markov number, appearing in the solutions (2, 169, 985), (2, 29, 169), (29, 169, 14701), ...

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 also one hundred sixty

For the year AD, see 169 AD. Integers

169 (nombre) | 169 | 169 | 169 (število)