90111791 has 16 divisors (see below), whose sum is σ = 112555008. Its totient is φ = 70087200.

The previous prime is 90111767. The next prime is 90111793. The reversal of 90111791 is 19711109.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90111791 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 (90111793) 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, 81146 + ... + 82248.

It is an arithmetic number, because the mean of its divisors is an integer number (7034688).

Almost surely, 2^90111791 is an apocalyptic number.

90111791 is a deficient number, since it is larger than the sum of its proper divisors (22443217).

90111791 is a wasteful number, since it uses less digits than its factorization.

90111791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182.

The product of its (nonzero) digits is 567, while the sum is 29.

The square root of 90111791 is about 9492.7230550564. The cubic root of 90111791 is about 448.3259462982.

The spelling of 90111791 in words is "ninety million, one hundred eleven thousand, seven hundred ninety-one".