90911057 has 4 divisors (see below), whose sum is σ = 91419120. Its totient is φ = 90402996.

The previous prime is 90911047. The next prime is 90911069. The reversal of 90911057 is 75011909.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90911057 - 2¹² = 90906961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90911017) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 253763 + ... + 254120.

It is an arithmetic number, because the mean of its divisors is an integer number (22854780).

Almost surely, 2^90911057 is an apocalyptic number.

It is an amenable number.

90911057 is a deficient number, since it is larger than the sum of its proper divisors (508063).

90911057 is a wasteful number, since it uses less digits than its factorization.

90911057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508062.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 90911057 is about 9534.7289945756. The cubic root of 90911057 is about 449.6475544851.

The spelling of 90911057 in words is "ninety million, nine hundred eleven thousand, fifty-seven".