91085957 has 12 divisors (see below), whose sum is σ = 96198816. Its totient is φ = 86079840.

The previous prime is 91085933. The next prime is 91085989. The reversal of 91085957 is 75958019.

It is a happy number.

It is not a de Polignac number, because 91085957 - 2¹⁰ = 91084933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91085927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 431582 + ... + 431792.

It is an arithmetic number, because the mean of its divisors is an integer number (8016568).

Almost surely, 2^91085957 is an apocalyptic number.

It is an amenable number.

91085957 is a deficient number, since it is larger than the sum of its proper divisors (5112859).

91085957 is a wasteful number, since it uses less digits than its factorization.

91085957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 91085957 is about 9543.8963217336. The cubic root of 91085957 is about 449.9357225064.

The spelling of 91085957 in words is "ninety-one million, eighty-five thousand, nine hundred fifty-seven".