Fatto generale: 1541 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1541 is a value of n for which f(n) = f(n-1) + f(n-2).
Trivia: 1541 is an unremarkable number.
Data storica: March 20th is the day in 1951 that Fujiyoshida, a city located in Yamanashi Prefecture, Japan, in the center of the Japanese main island of Honshū is founded.