531520313 has 4 divisors (see below), whose sum is σ = 539453520. Its totient is φ = 523587108.

The previous prime is 531520309. The next prime is 531520337. The reversal of 531520313 is 313025135.

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 531520313 - 2² = 531520309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531523313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3966503 + ... + 3966636.

It is an arithmetic number, because the mean of its divisors is an integer number (134863380).

Almost surely, 2^531520313 is an apocalyptic number.

It is an amenable number.

531520313 is a deficient number, since it is larger than the sum of its proper divisors (7933207).

531520313 is an equidigital number, since it uses as much as digits as its factorization.

531520313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7933206.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 531520313 is about 23054.7243097808. The cubic root of 531520313 is about 810.0402931742.

Adding to 531520313 its reverse (313025135), we get a palindrome (844545448).

The spelling of 531520313 in words is "five hundred thirty-one million, five hundred twenty thousand, three hundred thirteen".