91032961 has 2 divisors, whose sum is σ = 91032962. Its totient is φ = 91032960.

The previous prime is 91032947. The next prime is 91032973. The reversal of 91032961 is 16923019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76895361 + 14137600 = 8769^2 + 3760^2 .

It is an emirp because it is prime and its reverse (16923019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91032961 - 2¹⁵ = 91000193 is a prime.

It is not a weakly prime, because it can be changed into another prime (91032901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45516480 + 45516481.

It is an arithmetic number, because the mean of its divisors is an integer number (45516481).

Almost surely, 2^91032961 is an apocalyptic number.

It is an amenable number.

91032961 is a deficient number, since it is larger than the sum of its proper divisors (1).

91032961 is an equidigital number, since it uses as much as digits as its factorization.

91032961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 91032961 is about 9541.1194835826. The cubic root of 91032961 is about 449.8484444366.

The spelling of 91032961 in words is "ninety-one million, thirty-two thousand, nine hundred sixty-one".