Fait général: 1573 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1573 is a value of n for which n, 2n, 3n, and 4n all use the same number of digits in Roman numerals.
Culture générale: 1573 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: April 21st is the day in 1987 that the Tamil Tigers are blamed for a car bomb that explodes in the Sri Lankan city of Colombo, killing 106 people.