189 (number)

189 is the natural number following 188 and preceding 190.

In mathematics

189 is a centered cube number and a heptagonal number.
The centered cube numbers are the sums of two consecutive cubes, and 189 can be written as sum of two cubes in two ways: and The smallest number that can be written as the sum of two positive cubes in two ways is 1729.
The largest prime number that can be represented in 256-bit arithmetic is the "ultra-useful prime" used in quasi-Monte Carlo methods and in some cryptographic systems.