Fatto generale: 1931 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1931 is the smallest number whose 7^{th} power has 23 digits.
Trivia: 1931 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 14th is the day in 1890 that the Pan-American Union is founded by the First International Conference of American States in Washington, D.C.