Fatto matematico: 52170 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 52170 is an uninteresting number.
Data storica: November 1st is the day in 1950 that Puerto Rican nationalists Griselio Torresola and Oscar Collazo attempt to assassinate US President Harry S. Truman at Blair House.