General fact: 4819 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 4819 is a Tetranacci-like number starting from 1, 1, 1, and 1.
Trivia: 4819 is a boring number.
Historical date: March 11th is the day in 1872 that the Meiji Japanese government officially annexes the Ryukyu Kingdom into what would become the Okinawa prefecture.