# 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 781

- The diagonals of a regular tridecagon divide it into 50 regions
- 781 is the sum of the first five powers of 5: 781 = 1 + 5 + 25 + 125 + 625
- 781 is the smallest strong pseudoprime to base 5