Hecho general: 8931 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 8931 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 8931 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: June 13th is the day in 1525 that Martin Luther marries Katharina von Bora, against the celibacy rule decreed by the Roman Catholic Church for priests and nuns.