91957285 has 16 divisors (see below), whose sum is σ = 126850176. Its totient is φ = 62687808.

The previous prime is 91957273. The next prime is 91957291. The reversal of 91957285 is 58275919.

It is a cyclic number.

It is not a de Polignac number, because 91957285 - 2⁷ = 91957157 is a prime.

It is a super-2 number, since 2×91957285² = 16912284529142450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539 + ... + 13648.

It is an arithmetic number, because the mean of its divisors is an integer number (7928136).

Almost surely, 2^91957285 is an apocalyptic number.

It is an amenable number.

91957285 is a deficient number, since it is larger than the sum of its proper divisors (34892891).

91957285 is a wasteful number, since it uses less digits than its factorization.

91957285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15372.

The product of its digits is 226800, while the sum is 46.

The square root of 91957285 is about 9589.4361148088. The cubic root of 91957285 is about 451.3658665079.

The spelling of 91957285 in words is "ninety-one million, nine hundred fifty-seven thousand, two hundred eighty-five".