531245513 has 4 divisors (see below), whose sum is σ = 554343168. Its totient is φ = 508147860.

The previous prime is 531245509. The next prime is 531245527. The reversal of 531245513 is 315542135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 531245513 - 2² = 531245509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531245503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11548793 + ... + 11548838.

It is an arithmetic number, because the mean of its divisors is an integer number (138585792).

Almost surely, 2^531245513 is an apocalyptic number.

It is an amenable number.

531245513 is a deficient number, since it is larger than the sum of its proper divisors (23097655).

531245513 is a wasteful number, since it uses less digits than its factorization.

531245513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23097654.

The product of its digits is 9000, while the sum is 29.

The square root of 531245513 is about 23048.7638063303. The cubic root of 531245513 is about 809.9006701344.

Adding to 531245513 its reverse (315542135), we get a palindrome (846787648).

The spelling of 531245513 in words is "five hundred thirty-one million, two hundred forty-five thousand, five hundred thirteen".