Fatto generale: 5541 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5541 is a boring number.
Trivia: 5541 is an unremarkable number.
Data storica: March 3rd is the day in 1985 that a magnitude 8.3 earthquake struck the Valparaíso Region of Chile, killing 177 and leaving nearly a million people homeless.