320540431 has 4 divisors (see below), whose sum is σ = 337411000. Its totient is φ = 303669864.

The previous prime is 320540417. The next prime is 320540453. The reversal of 320540431 is 134045023.

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

It is a cyclic number.

It is not a de Polignac number, because 320540431 - 2⁵ = 320540399 is a prime.

It is a super-2 number, since 2×320540431² = 205492335811331522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320540411) 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, 8435256 + ... + 8435293.

It is an arithmetic number, because the mean of its divisors is an integer number (84352750).

Almost surely, 2^320540431 is an apocalyptic number.

320540431 is a deficient number, since it is larger than the sum of its proper divisors (16870569).

320540431 is a wasteful number, since it uses less digits than its factorization.

320540431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16870568.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 320540431 is about 17903.6429533210. The cubic root of 320540431 is about 684.3752137806.

Adding to 320540431 its reverse (134045023), we get a palindrome (454585454).

The spelling of 320540431 in words is "three hundred twenty million, five hundred forty thousand, four hundred thirty-one".