331256845961 has 2 divisors, whose sum is σ = 331256845962. Its totient is φ = 331256845960.

The previous prime is 331256845901. The next prime is 331256845987. The reversal of 331256845961 is 169548652133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315541716361 + 15715129600 = 561731^2 + 125360^2 .

It is a cyclic number.

It is not a de Polignac number, because 331256845961 - 2³⁰ = 330183104137 is a prime.

It is not a weakly prime, because it can be changed into another prime (331256845901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165628422980 + 165628422981.

It is an arithmetic number, because the mean of its divisors is an integer number (165628422981).

Almost surely, 2^331256845961 is an apocalyptic number.

It is an amenable number.

331256845961 is a deficient number, since it is larger than the sum of its proper divisors (1).

331256845961 is an equidigital number, since it uses as much as digits as its factorization.

331256845961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 53.

The spelling of 331256845961 in words is "three hundred thirty-one billion, two hundred fifty-six million, eight hundred forty-five thousand, nine hundred sixty-one".