Fait général: 2817 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2817 is a member of the Fibonacci-type sequence starting with 1 and 4.
Culture générale: 2817 is an uninteresting number.
Date historique: September 17th is the day in 1814 that Francis Scott Key finishes his poem "Defence of Fort McHenry", later to be the lyrics of "The Star-Spangled Banner".