Fatto generale: 8500 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 8500 is an unremarkable number.
Trivia: 8500 is an uninteresting number.
Data storica: April 9th is the day in 1992 that a U.S. Federal Court finds former Panamanian dictator Manuel Noriega guilty of drug and racketeering charges.