Fatto generale: 63631 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 63631 is a boring number.
Trivia: 63631 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 19th is the day in 2004 that a Swedish DC-3 shot down by a Russian MiG-15 in 1952 over the Baltic Sea is finally recovered after years of work.