153

153 = 3² x 17.

153 is the 17th triangular number. It is also a hexagonal number.

153 = 1! + 2! + 3! + 4! + 5!

153 is palindromic in base 2 (binary): 10011001. It is 2121 in base 4 and 99 in base 16.

153 is the smallest number greater than 1 such that the sum of the cubes of its digits equals itself: 153 = 1³ + 5³ + 3³.

153 has a representation as a sum of two squares: 153 = 3² + 12².

In the Bible, Simon Peter is said to have caught 153 fish (John 21:11).

Source: Number Gossip