General fact: 4649 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4649 is a boring number.
Trivia: 4649 is an uninteresting number.
Historical date: September 22nd is the day in 1789 that Battle of Rymnik establishes Alexander Suvorov as a pre-eminent Russian military commander after his allied army defeat superior Ottoman Empire forces.