Hecho general: 54500 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 54500 is a boring number.
Trivia: 54500 is an unremarkable number.
Fecha histórica: March 19th is the day in 2004 that a Swedish DC-3 shot down by a Russian MiG-15 in 1952 over the Baltic Sea is finally recovered after years of work.