Fait général: 11555 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 11555 is a boring number.
Culture générale: 11555 is a boring number.
Date historique: August 20th is the day in 1989 that the pleasure boat Marchioness sinks on the River Thames following a collision, 51 people are killed.