Fatto matematico: 50631 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 50631 is an unremarkable number.
Data storica: August 15th is the day in 1975 that Miki Takeo makes the first official pilgrimage to Yasukuni Shrine by an incumbent prime minister on the anniversary of the end of World War II.