Fatto generale: 1345 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1345 is the number of permutations of 8 elements that have 5^{th} power equal to the identity permutation.
Trivia: 1345 is a boring number.
Data storica: September 6th is the day in 1901 that Anarchist Leon Czolgosz shoots and fatally wounds US President William McKinley at the Pan-American Exposition in Buffalo, New York.