Fatto generale: 91976 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 91976 is an unremarkable number.
Trivia: 91976 is an uninteresting number.
Data storica: October 27th is the day in 1795 that the United States and Spain sign the Treaty of Madrid, which establishes the boundaries between Spanish colonies and the U.S.