320521231 has 8 divisors (see below), whose sum is σ = 328573728. Its totient is φ = 312480000.

The previous prime is 320521219. The next prime is 320521277. The reversal of 320521231 is 132125023.

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 320521231 - 2⁵ = 320521199 is a prime.

It is a super-2 number, since 2×320521231² = 205467719043510722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320521199 and 320521208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320521211) 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 7 ways as a sum of consecutive naturals, for example, 113031 + ... + 115831.

It is an arithmetic number, because the mean of its divisors is an integer number (41071716).

Almost surely, 2^320521231 is an apocalyptic number.

320521231 is a deficient number, since it is larger than the sum of its proper divisors (8052497).

320521231 is a wasteful number, since it uses less digits than its factorization.

320521231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 320521231 is about 17903.1067415686. The cubic root of 320521231 is about 684.3615490806.

Adding to 320521231 its reverse (132125023), we get a palindrome (452646254).

The spelling of 320521231 in words is "three hundred twenty million, five hundred twenty-one thousand, two hundred thirty-one".