Fait mathématique: 1381 is the number of anisohedral 17-ominoes.
Culture générale: 1381 is an unremarkable number.
Date historique: October 12th is the day in 1979 that the lowest recorded non-tornadic atmospheric pressure, 87.0 kPa (870 mbar or 25.69 inHg), occurred in the Western Pacific during Typhoon Tip.