Fatto generale: 63631 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 63631 is an uninteresting number.
Trivia: 63631 is an uninteresting number.
Data storica: March 19th is the day in 1649 that the House of Commons of England passes an act abolishing the House of Lords, declaring it "useless and dangerous to the people of England".