Fatto generale: 1881 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1881 is an uninteresting number.
Trivia: 1881 is an uninteresting number.
Data storica: February 23rd is the day in 1905 that Chicago attorney Paul Harris and three other businessmen meet for lunch to form the Rotary Club, the world's first service club.