91290057 has 16 divisors (see below), whose sum is σ = 126840000. Its totient is φ = 58330944.

The previous prime is 91290047. The next prime is 91290091. The reversal of 91290057 is 75009219.

It is not a de Polignac number, because 91290057 - 2⁶ = 91289993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91290037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8319 + ... + 15867.

It is an arithmetic number, because the mean of its divisors is an integer number (7927500).

Almost surely, 2^91290057 is an apocalyptic number.

It is an amenable number.

91290057 is a deficient number, since it is larger than the sum of its proper divisors (35549943).

91290057 is a wasteful number, since it uses less digits than its factorization.

91290057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 91290057 is about 9554.5830364281. The cubic root of 91290057 is about 450.2715348854.

The spelling of 91290057 in words is "ninety-one million, two hundred ninety thousand, fifty-seven".