Number Gossip

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Unique Properties of 1681

  • 1681 (= 412), is smallest composite number generated by the Euler polynomial n2 + n + 41
  • 1681 is the only four-digit square not ending in two zeroes such that each of its two 2-digit parts is a square
  • 1681 is the smallest number n such that n*prime(n)+(n+1)*prime(n+1) is a perfect square

Rare Properties of 1681

Square

Common Properties of 1681

Composite
Deficient
Odd
Odious
Powerful