331322137 has 2 divisors, whose sum is σ = 331322138. Its totient is φ = 331322136.

The previous prime is 331322077. The next prime is 331322219. The reversal of 331322137 is 731223133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207244816 + 124077321 = 14396^2 + 11139^2 .

It is a cyclic number.

It is not a de Polignac number, because 331322137 - 2¹⁵ = 331289369 is a prime.

It is not a weakly prime, because it can be changed into another prime (331320137) 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, 165661068 + 165661069.

It is an arithmetic number, because the mean of its divisors is an integer number (165661069).

Almost surely, 2^331322137 is an apocalyptic number.

It is an amenable number.

331322137 is a deficient number, since it is larger than the sum of its proper divisors (1).

331322137 is an equidigital number, since it uses as much as digits as its factorization.

331322137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 25.

The square root of 331322137 is about 18202.2563711206. The cubic root of 331322137 is about 691.9639746746.

The spelling of 331322137 in words is "three hundred thirty-one million, three hundred twenty-two thousand, one hundred thirty-seven".