Fait mathématique: 1581 is the smallest number whose 8^{th} power contains exactly the same digits as another 8^{th} power.
Culture générale: 1581 is an uninteresting number.
Date historique: April 29th is the day in 1953 that the first U.S. experimental 3D-TV broadcast showed an episode of Space Patrol on Los Angeles ABC affiliate KECA-TV.