Number Gossip

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Unique Properties of 225

  • 225 is the smallest square that starts with 2 identical digits
  • 225 is the smallest octagonal square (except trivial 1)
  • 225 is the smallest square whose external digits form a square and whose internal digits form a prime
  • 225 is the only three-digit square with all prime digits
  • 225 is the smallest square that remain a square if prefixed with 1
  • 225 is the smallest square which is pandigital is some base: 225 is 3201 is base 4
  • 225 is the smallest odd power that is not prime power
  • 225 is the smallest sum of a set of odd numbers that contain every digit once

Rare Properties of 225

Square

Common Properties of 225

Composite
Deficient
Evil
Odd
Powerful