general_fact: 4561 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4561 is a boring number.
trivia: 4561 is an unremarkable number.
historical_date: June 26th is the day in 1541 that Francisco Pizarro is assassinated in Lima by the son of his former companion and later antagonist, Diego Almagro the younger.