9911791 has 8 divisors (see below), whose sum is σ = 10227168. Its totient is φ = 9600000.

The previous prime is 9911789. The next prime is 9911809. The reversal of 9911791 is 1971199.

9911791 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 10-Lehmer number, since φ(9911791) divides (9911791-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 9911791 - 2¹ = 9911789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9911791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9911701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5391 + ... + 6991.

It is an arithmetic number, because the mean of its divisors is an integer number (1278396).

Almost surely, 2^9911791 is an apocalyptic number.

9911791 is a deficient number, since it is larger than the sum of its proper divisors (315377).

9911791 is a wasteful number, since it uses less digits than its factorization.

9911791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793.

The product of its digits is 5103, while the sum is 37.

The square root of 9911791 is about 3148.2996998380. The cubic root of 9911791 is about 214.8081288024.

The spelling of 9911791 in words is "nine million, nine hundred eleven thousand, seven hundred ninety-one".