Fait général: 1031 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1031 is the length of the largest repunit that is known to be prime.
Culture générale: 1031 is an unremarkable number.
Date historique: October 27th is the day in 1904 that the first underground New York City Subway line opens; the system becomes the biggest in United States, and one of the biggest in world.