4991106591 has 6 divisors (see below), whose sum is σ = 7209376200. Its totient is φ = 3327404388.

The previous prime is 4991106581. The next prime is 4991106613. The reversal of 4991106591 is 1956011994.

4991106591 is a `hidden beast` number, since 49 + 9 + 1 + 10 + 6 + 591 = 666.

It is not a de Polignac number, because 4991106591 - 2⁹ = 4991106079 is a prime.

It is a super-2 number, since 2×4991106591² = 49822290005447282562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991106511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 277283691 + ... + 277283708.

It is an arithmetic number, because the mean of its divisors is an integer number (1201562700).

Almost surely, 2^4991106591 is an apocalyptic number.

4991106591 is a deficient number, since it is larger than the sum of its proper divisors (2218269609).

4991106591 is a wasteful number, since it uses less digits than its factorization.

4991106591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554567405 (or 554567402 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 4991106591 is about 70647.7642321397. The cubic root of 4991106591 is about 1708.9615106208.

The spelling of 4991106591 in words is "four billion, nine hundred ninety-one million, one hundred six thousand, five hundred ninety-one".