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 unremarkable number.
Date historique: April 29th is the day in 1483 that Gran Canaria, the main of the Canary Islands is conquered by the Kingdom of Castile, very important step in the expansion of Spain.