91122187 has 4 divisors (see below), whose sum is σ = 98131600. Its totient is φ = 84112776.

The previous prime is 91122173. The next prime is 91122191. The reversal of 91122187 is 78122119.

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 91122187 - 2¹⁵ = 91089419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91122107) 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, 3504687 + ... + 3504712.

It is an arithmetic number, because the mean of its divisors is an integer number (24532900).

Almost surely, 2^91122187 is an apocalyptic number.

91122187 is a deficient number, since it is larger than the sum of its proper divisors (7009413).

91122187 is a wasteful number, since it uses less digits than its factorization.

91122187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7009412.

The product of its digits is 2016, while the sum is 31.

The square root of 91122187 is about 9545.7942047794. The cubic root of 91122187 is about 449.9953694997.

The spelling of 91122187 in words is "ninety-one million, one hundred twenty-two thousand, one hundred eighty-seven".