Fatto generale: 1539 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1539 is an uninteresting number.
Trivia: 1539 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 18th is the day in 1959 that President Dwight D. Eisenhower signs a bill into law allowing for Hawaiian statehood, which would become official on August 21.