general_fact: 2513 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2513 is a boring number.
trivia: 2513 is an unremarkable number.
historical_date: 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").