Fatto matematico: 91801 is an unremarkable number.
Trivia: 91801 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: May 5th is the day in 1941 that Emperor Haile Selassie returns to Addis Ababa, Ethiopia; the country commemorates the date as Liberation Day or Patriots' Victory Day.