91086911 has 4 divisors (see below), whose sum is σ = 91115712. Its totient is φ = 91058112.

The previous prime is 91086907. The next prime is 91086937. The reversal of 91086911 is 11968019.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91086911 - 2² = 91086907 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 (91086011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8975 + ... + 16208.

It is an arithmetic number, because the mean of its divisors is an integer number (22778928).

Almost surely, 2^91086911 is an apocalyptic number.

91086911 is a deficient number, since it is larger than the sum of its proper divisors (28801).

91086911 is a wasteful number, since it uses less digits than its factorization.

91086911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28800.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 91086911 is about 9543.9463011901. The cubic root of 91086911 is about 449.9372933200.

The spelling of 91086911 in words is "ninety-one million, eighty-six thousand, nine hundred eleven".