Hecho matemático: 1573 is a value of n for which n, 2n, 3n, and 4n all use the same number of digits in Roman numerals.
Trivia: 1573 is an uninteresting number.
Fecha histórica: April 21st is the day in 1922 that the first Aggie Muster is held as a remembrance for fellow Texas A&M graduates who had died in the previous year.