8911391 has 4 divisors (see below), whose sum is σ = 9128784. Its totient is φ = 8694000.

The previous prime is 8911379. The next prime is 8911433. The reversal of 8911391 is 1931198.

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 8911391 - 2²² = 4717087 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 (8911321) 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, 108635 + ... + 108716.

It is an arithmetic number, because the mean of its divisors is an integer number (2282196).

Almost surely, 2^8911391 is an apocalyptic number.

8911391 is a deficient number, since it is larger than the sum of its proper divisors (217393).

8911391 is a wasteful number, since it uses less digits than its factorization.

8911391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217392.

The product of its digits is 1944, while the sum is 32.

The square root of 8911391 is about 2985.1953034936. The cubic root of 8911391 is about 207.3234846652.

The spelling of 8911391 in words is "eight million, nine hundred eleven thousand, three hundred ninety-one".