169 (number)
Encyclopedia : 1 : 16 : 169 : 169 (number)
169 is the natural number following 168 and preceding 170.
| |||
| 169 | |||
|---|---|---|---|
| Cardinal | one hundred [and] sixty-nine | ||
| Ordinal | 169th | ||
| Factorization | [169 = 13^2] | ||
| Roman numeral | CLXIX | ||
| Binary | 10101001 | ||
| Hexadecimal | A9 | ||
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.
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