Did you know that the number 31 ...

... is XXXI in Roman Numerals?
... is the third Mersenne Prime (2^5 - 1)?
... is a twin Prime (with 29)?
... is a centered triangular number, a centered pentagonal number, and a centered decagonal number?
... is a self number?
... divides every 15th number of the form 3...31?
... is the atomic number of Gallium, a metal which melts at only 85 degrees?
... is the Messier number of the Andromeda Galaxy?
... was the jersey number of the legendary Greg Maddux, the first MLB pitcher to win the Cy Young award 4 years in a row, and has been retired by both the Cubs and the Braves?
... is the number of musical triads?
... is the number of flavors at Baskin-Robbins?
... was the year B.C. that Octavian Caesar's naval forces defeated those of Mark Antony and Cleopatra at the Battle of Actium?
... was possibly the year Christ was crucified?
... is the age of Joe Belland as of today?

Happy Birthday, Joe!