General fact: 51787 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 51787 is an uninteresting number.
Trivia: 51787 is a boring number.
Historical date: October 14th is the day in 1322 that Robert the Bruce of Scotland defeats King Edward II of England at Byland, forcing Edward to accept Scotland's independence.