91230961 has 2 divisors, whose sum is σ = 91230962. Its totient is φ = 91230960.

The previous prime is 91230877. The next prime is 91231009. The reversal of 91230961 is 16903219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76020961 + 15210000 = 8719^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 91230961 - 2⁷ = 91230833 is a prime.

It is not a weakly prime, because it can be changed into another prime (91230361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45615480 + 45615481.

It is an arithmetic number, because the mean of its divisors is an integer number (45615481).

Almost surely, 2^91230961 is an apocalyptic number.

It is an amenable number.

91230961 is a deficient number, since it is larger than the sum of its proper divisors (1).

91230961 is an equidigital number, since it uses as much as digits as its factorization.

91230961 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 91230961 is about 9551.4899884782. The cubic root of 91230961 is about 450.1743538365.

The spelling of 91230961 in words is "ninety-one million, two hundred thirty thousand, nine hundred sixty-one".