90091161 has 12 divisors (see below), whose sum is σ = 135789888. Its totient is φ = 57449304.

The previous prime is 90091123. The next prime is 90091163. The reversal of 90091161 is 16119009.

It is not a de Polignac number, because 90091161 - 2⁶ = 90091097 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (90091163) 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, 217405 + ... + 217818.

It is an arithmetic number, because the mean of its divisors is an integer number (11315824).

Almost surely, 2^90091161 is an apocalyptic number.

It is an amenable number.

90091161 is a deficient number, since it is larger than the sum of its proper divisors (45698727).

90091161 is a wasteful number, since it uses less digits than its factorization.

90091161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435252 (or 435249 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 90091161 is about 9491.6363710374. The cubic root of 90091161 is about 448.2917307604.

The spelling of 90091161 in words is "ninety million, ninety-one thousand, one hundred sixty-one".