91100855 has 4 divisors (see below), whose sum is σ = 109321032. Its totient is φ = 72880680.

The previous prime is 91100837. The next prime is 91100857. The reversal of 91100855 is 55800119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55800119 = 2087 ⋅26737.

It is not a de Polignac number, because 91100855 - 2¹⁰ = 91099831 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 (91100857) 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, 9110081 + ... + 9110090.

It is an arithmetic number, because the mean of its divisors is an integer number (27330258).

Almost surely, 2^91100855 is an apocalyptic number.

91100855 is a deficient number, since it is larger than the sum of its proper divisors (18220177).

91100855 is a wasteful number, since it uses less digits than its factorization.

91100855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18220176.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 91100855 is about 9544.6767886608. The cubic root of 91100855 is about 449.9602516332.

The spelling of 91100855 in words is "ninety-one million, one hundred thousand, eight hundred fifty-five".