Fatto matematico: 4133 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 4133 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: April 25th is the day in 1644 that the Chongzhen Emperor, the last Emperor of Ming Dynasty China, commits suicide during a peasant rebellion led by Li Zicheng.