Fait général: 18901 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 18901 is an uninteresting number.
Culture générale: 18901 is a boring number.
Date historique: September 30th is the day in 1906 that the Real Academia Galega, Galician language's biggest linguistic authority, starts working in Havana.