Fatto generale: 1911 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1911 is a heptagonal pyramidal number.
Trivia: 1911 is an unremarkable number.
Data storica: March 25th is the day in 1949 that the extensive deportation campaign known as March deportation is conducted in Estonia, Latvia and Lithuania to force collectivisation by way of terror.