Fait mathématique: 1571 is the smallest number that can not be formed using the digit 1 at most 23 times, together with the symbols +, –, × and ÷.
Culture générale: 1571 is an unremarkable number.
Date historique: April 19th is the day in 65 that the freedman Milichus betrayed Piso’s plot to kill the Emperor Nero and all the conspirators were arrested.