Hecho general: 497 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 497 is the number of graphs with 8 edges.
Trivia: 497 is an unremarkable number.
Fecha histórica: May 11th is the day in 1812 that Prime Minister Spencer Perceval is assassinated by John Bellingham in the lobby of the House of Commons, London.