Hecho general: 54499 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 54499 is a boring number.
Trivia: 54499 is an unremarkable number.
Fecha histórica: March 18th is the day in 1965 that Cosmonaut Aleksei Leonov, leaving his spacecraft Voskhod 2 for 12 minutes, becomes the first person to walk in space.