Fait général: 15509 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 15509 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 15509 is an unremarkable number.
Date historique: June 17th is the day in 1940 that the three Baltic states of Estonia, Latvia and Lithuania fall under the occupation of the Soviet Union.