Number Gossip

(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)

Unique Properties of 25

  • 25 is the smallest square that can be written as a sum of 2 squares
  • 25 is the smallest multi-digit automorphic number
  • 25 is the only prime square whose digits are all prime
  • 25 is the smallest aspiring number
  • 25 is the smallest Friedman number, which means it can be written in a non-trivial way using its digits and standard operations: 25 = 52

Rare Properties of 25

Aspiring
Automorphic (Curious)
Square

Common Properties of 25

Composite
Deficient
Lucky
Odd
Odious
Powerful