Fait général: 50009 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 50009 is a boring number.
Culture générale: 50009 is an uninteresting number.
Date historique: December 1st is the day in 1990 that Channel Tunnel sections started from the United Kingdom and France meet 40 metres beneath the seabed.