Fait mathématique: 1481 is a number n for which n, n+2, n+6, and n+8 are all prime.
Culture générale: 1481 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: January 20th is the day in 1991 that Sudan's government imposes Islamic law nationwide, worsening the civil war between the country's Muslim north and Christian south.