Fatto generale: 13043 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 13043 is an unremarkable number.
Trivia: 13043 is an unremarkable number.
Data storica: September 16th is the day in 1966 that the Metropolitan Opera House opens at Lincoln Center in New York City with the world premiere of Samuel Barber's opera, Antony and Cleopatra.