91057585 has 12 divisors (see below), whose sum is σ = 110095668. Its totient is φ = 72298976.

The previous prime is 91057553. The next prime is 91057601. The reversal of 91057585 is 58575019.

It can be written as a sum of positive squares in 2 ways, for example, as 26801329 + 64256256 = 5177^2 + 8016^2 .

It is not a de Polignac number, because 91057585 - 2⁵ = 91057553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139119 + ... + 139771.

It is an arithmetic number, because the mean of its divisors is an integer number (9174639).

Almost surely, 2^91057585 is an apocalyptic number.

It is an amenable number.

91057585 is a deficient number, since it is larger than the sum of its proper divisors (19038083).

91057585 is an equidigital number, since it uses as much as digits as its factorization.

91057585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992 (or 825 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 91057585 is about 9542.4098109440. The cubic root of 91057585 is about 449.8890014295.

The spelling of 91057585 in words is "ninety-one million, fifty-seven thousand, five hundred eighty-five".