Fatto generale: 83543 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 83543 is an unremarkable number.
Trivia: 83543 is a boring number.
Data storica: September 24th is the day in 1780 that Benedict Arnold flees to British Army lines when the arrest of British Major John André exposes Arnold's plot to surrender West Point.