Fait mathématique: 2148 is the number of 15-ominoes with a horizontal or vertical line of symmetry.
Culture générale: 2148 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: November 17th is the day in 1903 that the Russian Social Democratic Labor Party splits into two groups; the Bolsheviks (Russian for "majority") and Mensheviks (Russian for "minority").