Hecho general: 52561 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 52561 is an unremarkable number.
Trivia: 52561 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: November 27th is the day in 1963 that the Convention on the Unification of Certain Points of Substantive Law on Patents for Invention is signed at Strasbourg.