Fatto generale: 491 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 491 is the smallest number n so that the largest prime factors of the numbers n through n+4 decrease.
Trivia: 491 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.