General fact: 54189 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 54189 is a boring number.
Trivia: 54189 is an uninteresting number.
Historical date: May 12th is the day in 1191 that Richard I of England marries Berengaria of Navarre who is crowned Queen consort of England the same day.