General fact: 13881 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 13881 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 13881 is an unremarkable number.
Historical date: January 1st is the day in 1801 that the legislative union of Kingdom of Great Britain and Kingdom of Ireland is completed to form the United Kingdom of Great Britain and Ireland.