Hecho general: 1535 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 1535 is an unremarkable number.
Trivia: 1535 is a boring number.
Fecha histórica: March 14th is the day in 1984 that Gerry Adams, head of Sinn Féin, is seriously wounded in an assassination attempt in central Belfast.