Mathematical fact: 13249 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 13249 is an unremarkable number.
Historical date: April 9th is the day in 1981 that the U.S. Navy nuclear submarine USS George Washington (SSBN-598) accidentally collides with the Nissho Maru, a Japanese cargo ship, sinking it.