Fait mathématique: 1153 is the smallest number with the property that its first 3 multiples contain the digit 3.
Culture générale: 1153 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: February 26th is the day in 1935 that Robert Watson-Watt carries out a demonstration near Daventry which leads directly to the development of RADAR in the United Kingdom.