320965531 has 4 divisors (see below), whose sum is σ = 324274552. Its totient is φ = 317656512.

The previous prime is 320965523. The next prime is 320965543. The reversal of 320965531 is 135569023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135569023 = 61 ⋅2222443.

It is a cyclic number.

It is not a de Polignac number, because 320965531 - 2³ = 320965523 is a prime.

It is a super-2 number, since 2×320965531² = 206037744180223922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320965031) 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, 1654365 + ... + 1654558.

It is an arithmetic number, because the mean of its divisors is an integer number (81068638).

Almost surely, 2^320965531 is an apocalyptic number.

320965531 is a deficient number, since it is larger than the sum of its proper divisors (3309021).

320965531 is an equidigital number, since it uses as much as digits as its factorization.

320965531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309020.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 320965531 is about 17915.5109053580. The cubic root of 320965531 is about 684.6776190942.

The spelling of 320965531 in words is "three hundred twenty million, nine hundred sixty-five thousand, five hundred thirty-one".