Fatto matematico: 1931 is the smallest number whose 7^{th} power has 23 digits.
Trivia: 1931 is an unremarkable number.
Data storica: April 14th is the day in 1294 that Temür, grandson of Kublai, is elected Khagan of the Mongols and Emperor of the Yuan Dynasty with the reigning titles Oljeitu and Chengzong.