Fatto generale: 9105 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9105 is the number of possible positions in Checkers after 6 moves.
Trivia: 9105 is a boring number.
Data storica: December 4th is the day in 1918 that U.S. President Woodrow Wilson sails for the World War I peace talks in Versailles, becoming the first US president to travel to Europe while in office.