Fatto matematico: 6174 is the Kaprekar constant for 4-digit numbers.
Trivia: 6174 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: November 25th is the day in 1874 that the United States Greenback Party is established as a political party consisting primarily of farmers affected by the Panic of 1873.