Fatto generale: 4159 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4159 is 4^{5} + 1^{5} + 5^{5} + 9.
Trivia: 4159 is an uninteresting number.
Data storica: May 21st is the day in 1996 that the Trappist Martyrs of Atlas, kidnapped during the Algerian Civil War and held for two months, are found dead.