• 530 can be written using four 4's:

See also 113.

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530 has 8 divisors (see below), whose sum is σ = 972. Its totient is φ = 208.

The previous prime is 523. The next prime is 541. The reversal of 530 is 35.

530 = T₁₂ + T₁₃ + ... + T₁₆.

530 is nontrivially palindromic in base 4 and base 16.

It is a Cunningham number, because it is equal to 23²+1.

530 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 529 + 1 = 23^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

530 is an undulating number in base 16.

It is a Curzon number.

It is a plaindrome in base 7, base 14 and base 15.

It is a nialpdrome in base 5, base 10 and base 11.

It is an unprimeable number.

530 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17 + ... + 36.

530 is a deficient number, since it is larger than the sum of its proper divisors (442).

530 is a wasteful number, since it uses less digits than its factorization.

530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60.

The product of its (nonzero) digits is 15, while the sum is 8.

The square root of 530 is about 23.0217288664. The cubic root of 530 is about 8.0926723346.

Adding to 530 its product of nonzero digits (15), we get a palindrome (545).

Subtracting from 530 its product of nonzero digits (15), we obtain a palindrome (515).

Adding to 530 its reverse (35), we get a palindrome (565).

The spelling of 530 in words is "five hundred thirty", and thus it is an aban number and an oban number.