91457957 has 2 divisors, whose sum is σ = 91457958. Its totient is φ = 91457956.

The previous prime is 91457917. The next prime is 91457983. The reversal of 91457957 is 75975419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71081761 + 20376196 = 8431^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 91457957 - 2¹⁴ = 91441573 is a prime.

It is a super-2 number, since 2×91457957² = 16729115797227698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91457917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45728978 + 45728979.

It is an arithmetic number, because the mean of its divisors is an integer number (45728979).

Almost surely, 2^91457957 is an apocalyptic number.

It is an amenable number.

91457957 is a deficient number, since it is larger than the sum of its proper divisors (1).

91457957 is an equidigital number, since it uses as much as digits as its factorization.

91457957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 396900, while the sum is 47.

The square root of 91457957 is about 9563.3653595374. The cubic root of 91457957 is about 450.5474111873.

The spelling of 91457957 in words is "ninety-one million, four hundred fifty-seven thousand, nine hundred fifty-seven".