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 891

  • 891 is the smallest odd number that differ from its prime neighbors by different squares
  • 891 is the smallest number which is the reversal of the sum of its proper substrings: 8 + 9 + 1 + 89 + 91 = 198

Common Properties of 891

Composite
Deficient
Evil
Odd
Ulam