Fatto generale: 9815 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9815 is an uninteresting number.
Trivia: 9815 is an unremarkable number.
Data storica: November 14th is the day in 2007 that the last direct-current electrical distribution system in the United States is shut down in New York City by Con Edison.