Fait mathématique: 1591 is the sum of the first 13 numbers that have digit sum 13.
Culture générale: 1591 is a boring number.
Date historique: May 9th is the day in 1987 that a Polish LOT Ilyushin IL-62M "Tadeusz Kościuszko" (SP-LBG) crashes after takeoff in Warsaw, Poland, killing 183 people.