General fact: 530 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 530 is the sum of the first 3 perfect numbers.
Trivia: 530 is a boring number.
Historical date: June 13th is the day in 1966 that the United States Supreme Court rules in Miranda v. Arizona that the police must inform suspects of their rights before questioning them.