Fait mathématique: 6811 is not the sum of a square, a cube, a 4^{th} power, and a 5^{th} power.
Culture générale: 6811 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: August 24th is the day in 2001 that Air Transat Flight 236 runs out of fuel over the Atlantic Ocean (en route to Lisbon from Toronto) and makes an emergency landing in the Azores.