Fatto generale: 4881 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 4881 is a boring number.
Trivia: 4881 is an unremarkable number.
Data storica: May 12th is the day in 1941 that Konrad Zuse presents the Z3, the world's first working programmable, fully automatic computer, in Berlin.