331207081 has 2 divisors, whose sum is σ = 331207082. Its totient is φ = 331207080.

The previous prime is 331207067. The next prime is 331207087. The reversal of 331207081 is 180702133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255360400 + 75846681 = 15980^2 + 8709^2 .

It is a cyclic number.

It is not a de Polignac number, because 331207081 - 2⁵ = 331207049 is a prime.

It is a super-2 number, since 2×331207081² = 219396261009081122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331207087) 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, 165603540 + 165603541.

It is an arithmetic number, because the mean of its divisors is an integer number (165603541).

Almost surely, 2^331207081 is an apocalyptic number.

It is an amenable number.

331207081 is a deficient number, since it is larger than the sum of its proper divisors (1).

331207081 is an equidigital number, since it uses as much as digits as its factorization.

331207081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 331207081 is about 18199.0956093977. The cubic root of 331207081 is about 691.8838675164.

The spelling of 331207081 in words is "three hundred thirty-one million, two hundred seven thousand, eighty-one".