Fatto generale: 63901 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 63901 is an uninteresting number.
Trivia: 63901 is a boring number.
Data storica: December 14th is the day in 1812 that the French invasion of Russia comes to an end as the remnants of the Grande Armée are expelled from Russia.