Fatto generale: 51787 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 51787 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 51787 is an unremarkable number.
Data storica: October 14th is the day in 1966 that the city of Montreal, Quebec, begins the operation of its underground Montreal Metro rapid-transit system.