961891320937 has 2 divisors, whose sum is σ = 961891320938. Its totient is φ = 961891320936.

The previous prime is 961891320839. The next prime is 961891320977. The reversal of 961891320937 is 739023198169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622956604176 + 338934716761 = 789276^2 + 582181^2 .

It is a cyclic number.

It is not a de Polignac number, because 961891320937 - 2⁷ = 961891320809 is a prime.

It is not a weakly prime, because it can be changed into another prime (961891320977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480945660468 + 480945660469.

It is an arithmetic number, because the mean of its divisors is an integer number (480945660469).

Almost surely, 2^961891320937 is an apocalyptic number.

It is an amenable number.

961891320937 is a deficient number, since it is larger than the sum of its proper divisors (1).

961891320937 is an equidigital number, since it uses as much as digits as its factorization.

961891320937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The spelling of 961891320937 in words is "nine hundred sixty-one billion, eight hundred ninety-one million, three hundred twenty thousand, nine hundred thirty-seven".