189 (one hundred [and] eighty-nine) is the natural number following 188 and preceding 190.
| ||||
---|---|---|---|---|
Cardinal | one hundred eighty-nine | |||
Ordinal | 189th (one hundred eighty-ninth) | |||
Factorization | 33 × 7 | |||
Greek numeral | ΡΠΘ´ | |||
Roman numeral | CLXXXIX | |||
Binary | 101111012 | |||
Ternary | 210003 | |||
Senary | 5136 | |||
Octal | 2758 | |||
Duodecimal | 13912 | |||
Hexadecimal | BD16 |
189 is a centered cube number[1] and a heptagonal number.[2] The centered cube numbers are the sums of two consecutive cubes, and 189 can be written as sum of two cubes in two ways: 43 + 53 and 63 + (−3)3.[3] The smallest number that can be written as the sum of two positive cubes in two ways is 1729.[4]
There are 189 zeros among the decimal digits of the positive integers with at most three digits.[5]
The largest prime number that can be represented in 256-bit arithmetic is the "ultra-useful prime" 2256 − 189,[6] used in quasi-Monte Carlo methods[7] and in some cryptographic systems.[8]