Hecho general: 54181 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 54181 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 54181 is a boring number.
Fecha histórica: May 4th is the day in 2001 that the Milwaukee Art Museum addition, the first Santiago Calatrava-designed structure in the United States, opens to the public.