320756431 has 2 divisors, whose sum is σ = 320756432. Its totient is φ = 320756430.

The previous prime is 320756419. The next prime is 320756437. The reversal of 320756431 is 134657023.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320756431 is a prime.

It is a super-2 number, since 2×320756431² = 205769376055715522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 320756393 and 320756402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320756437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160378215 + 160378216.

It is an arithmetic number, because the mean of its divisors is an integer number (160378216).

Almost surely, 2^320756431 is an apocalyptic number.

320756431 is a deficient number, since it is larger than the sum of its proper divisors (1).

320756431 is an equidigital number, since it uses as much as digits as its factorization.

320756431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 320756431 is about 17909.6742293097. The cubic root of 320756431 is about 684.5289040692.

The spelling of 320756431 in words is "three hundred twenty million, seven hundred fifty-six thousand, four hundred thirty-one".