320442131 has 2 divisors, whose sum is σ = 320442132. Its totient is φ = 320442130.

The previous prime is 320442127. The next prime is 320442137. The reversal of 320442131 is 131244023.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 320442131 - 2² = 320442127 is a prime.

It is a super-2 number, since 2×320442131² = 205366318639642322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (320442137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160221065 + 160221066.

It is an arithmetic number, because the mean of its divisors is an integer number (160221066).

Almost surely, 2^320442131 is an apocalyptic number.

320442131 is a deficient number, since it is larger than the sum of its proper divisors (1).

320442131 is an equidigital number, since it uses as much as digits as its factorization.

320442131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 320442131 is about 17900.8974914667. The cubic root of 320442131 is about 684.3052476077.

Adding to 320442131 its reverse (131244023), we get a palindrome (451686154).

The spelling of 320442131 in words is "three hundred twenty million, four hundred forty-two thousand, one hundred thirty-one".