Fatto matematico: 7351 is a value of n for which n, 2n, 3n, and 4n all use the same number of digits in Roman numerals.
Trivia: 7351 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: February 15th is the day in 1961 that Sabena Flight 548 crashes in Belgium, killing 73, including the entire United States figure skating team, several coaches and family members.