Fatto generale: 6173 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6173 is a prime that remains prime if any digit is deleted.
Trivia: 6173 is an uninteresting number.
Data storica: November 24th is the day in 1642 that Abel Tasman becomes the first European to discover the island Van Diemen's Land (later renamed Tasmania).