253

253 = 11 x 23.

253 is a triangular number (the sum of the integers from 1 to 22).

253 has a unique representation as a sum of three squares: 253 = 3² + 10² + 12².

253 is the sum of three positive cubes: 253 = 5³ + 4³ + 4³.

2⁵ - 3 is a prime number.


253 is a star number. The nth star number is given by the formula 6n(n - 1) + 1.


NGC 253, also known as the Silver Coin Galaxy or the Sculptor Galaxy, is a large spiral galaxy in the constellation Sculptor.

Source: Wikipedia