90211085 has 16 divisors (see below), whose sum is σ = 112097280. Its totient is φ = 69621120.

The previous prime is 90211073. The next prime is 90211087. The reversal of 90211085 is 58011209.

It is a happy number.

It is not a de Polignac number, because 90211085 - 2⁸ = 90210829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90211087) 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, 62684 + ... + 64106.

It is an arithmetic number, because the mean of its divisors is an integer number (7006080).

Almost surely, 2^90211085 is an apocalyptic number.

It is an amenable number.

90211085 is a deficient number, since it is larger than the sum of its proper divisors (21886195).

90211085 is a wasteful number, since it uses less digits than its factorization.

90211085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 90211085 is about 9497.9516212708. The cubic root of 90211085 is about 448.4905556695.

The spelling of 90211085 in words is "ninety million, two hundred eleven thousand, eighty-five".