Hecho general: 81131 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 81131 is an unremarkable number.
Trivia: 81131 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: February 16th is the day in 1959 that Fidel Castro becomes Premier of Cuba after dictator Fulgencio Batista was overthrown on January 1.