Fatto generale: 9104 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9104 is an unremarkable number.
Trivia: 9104 is an unremarkable number.
Data storica: December 3rd is the day in 1912 that Bulgaria, Greece, Montenegro, and Serbia (the Balkan League) sign an armistice with Turkey, ending the two-month long First Balkan War.