Fait général: 13811 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 13811 is an unremarkable number.
Culture générale: 13811 is an unremarkable number.
Date historique: October 23rd is the day in 1861 that U.S. President Abraham Lincoln suspends the writ of habeas corpus in Washington, D.C., for all military-related cases.