320531513 has 8 divisors (see below), whose sum is σ = 323767488. Its totient is φ = 317311344.

The previous prime is 320531507. The next prime is 320531527. The reversal of 320531513 is 315135023.

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

It is a cyclic number.

It is not a de Polignac number, because 320531513 - 2⁸ = 320531257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320531543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39131 + ... + 46607.

It is an arithmetic number, because the mean of its divisors is an integer number (40470936).

Almost surely, 2^320531513 is an apocalyptic number.

It is an amenable number.

320531513 is a deficient number, since it is larger than the sum of its proper divisors (3235975).

320531513 is a wasteful number, since it uses less digits than its factorization.

320531513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7903.

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

The square root of 320531513 is about 17903.3938961304. The cubic root of 320531513 is about 684.3688668800.

Adding to 320531513 its reverse (315135023), we get a palindrome (635666536).

The spelling of 320531513 in words is "three hundred twenty million, five hundred thirty-one thousand, five hundred thirteen".