Fatto generale: 2313 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2313 is a boring number.
Trivia: 2313 is an unremarkable number.
Data storica: May 1st is the day in 1971 that Amtrak (the National Railroad Passenger Corporation) takes over operation of U.S. passenger rail service.