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 1681

  • 1681 is the only four-digit square not ending in two zeroes such that each of its two 2-digit parts is a square

Rare Properties of 1681

Square

Common Properties of 1681

Composite
Deficient
Odd
Odious
Powerful