Hecho general: 81541 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 81541 is an uninteresting number.
Trivia: 81541 is an uninteresting number.
Fecha histórica: April 2nd is the day in 1902 that Dmitry Sipyagin, Minister of Interior of the Russian Empire, is assassinated in the Marie Palace, St Petersburg.