320524513 has 4 divisors (see below), whose sum is σ = 321324228. Its totient is φ = 319724800.

The previous prime is 320524507. The next prime is 320524517. The reversal of 320524513 is 315425023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 310746384 + 9778129 = 17628^2 + 3127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320524513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320524517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399256 + ... + 400057.

It is an arithmetic number, because the mean of its divisors is an integer number (80331057).

Almost surely, 2^320524513 is an apocalyptic number.

It is an amenable number.

320524513 is a deficient number, since it is larger than the sum of its proper divisors (799715).

320524513 is an equidigital number, since it uses as much as digits as its factorization.

320524513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799714.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 320524513 is about 17903.1984014030. The cubic root of 320524513 is about 684.3638849289.

Adding to 320524513 its reverse (315425023), we get a palindrome (635949536).

The spelling of 320524513 in words is "three hundred twenty million, five hundred twenty-four thousand, five hundred thirteen".