Hecho general: 53451 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 53451 is an uninteresting number.
Trivia: 53451 is an unremarkable number.
Fecha histórica: May 5th is the day in 1215 that Rebel barons renounce their allegiance to King John of England — part of a chain of events leading to the signing of the Magna Carta.