The given answer, 1649, is the decimal representation of the Roman numeral MDCXLIX. In Roman numerals, M represents 1000, D represents 500, C represents 100, L represents 50, and X represents 10. Therefore, MDCXLIX can be broken down as 1000 + 500 + 100 + 50 + 10 - 1, which equals 1649 in decimal form.