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 1999

  • 1999 is the least prime number such that the sum of its digits is a perfect number
  • 1999 is the smallest positive convenience store number, aka number n of the form − 7n + n11
  • 1999 is the smallest penultimate year of a millennium that is prime
  • 1999 is the smallest prime of the form 666n + 1

Common Properties of 1999

Deficient
Odd
Odious
Prime
Square-free
Twin