Fatto generale: 1532 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1532 is the number of series-parallel networks with 9 unlabeled edges.
Trivia: 1532 is a boring number.
Data storica: March 11th is the day in 1708 that Queen Anne withholds Royal Assent from the Scottish Militia Bill, the last time a British monarch vetoes legislation.