Fatto generale: 530 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 530 is the sum of the first 3 perfect numbers.
Trivia: 530 is an uninteresting number.
Data storica: June 13th is the day in 1977 that Convicted Martin Luther King Jr. assassin James Earl Ray is recaptured after escaping from prison three days before.