169 (one hundred sixty-nine) is the natural number following 168 and preceding 170.
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Cardinal | one hundred sixty-nine | |||
Ordinal | 169th (one hundred sixty-ninth) | |||
Factorization | 132 | |||
Divisors | 1, 13, 169 | |||
Greek numeral | ΡΞΘ´ | |||
Roman numeral | CLXIX | |||
Binary | 101010012 | |||
Ternary | 200213 | |||
Senary | 4416 | |||
Octal | 2518 | |||
Duodecimal | 12112 | |||
Hexadecimal | A916 |
169 is an odd number, a composite number, and a deficient number.
169 is a square number: 13 × 13 = 169, and if each number is reversed the equation is still true: 31 × 31 = 961. 144 shares this property: 12 × 12 = 144, 21 × 21 = 441.
169 is one of the few squares to also be a centered hexagonal number. Like all odd squares, it is a centered octagonal number. 169 is an odd-indexed Pell number, thus it is also a Markov number, appearing in the solutions (2, 169, 985), (2, 29, 169), (29, 169, 14701), etc. 169 is the sum of seven consecutive primes: 13 + 17 + 19 + 23 + 29 + 31 + 37. 169 is a difference in consecutive cubes, equaling
169 is also:
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