391191158879 has 4 divisors (see below), whose sum is σ = 391844233200. Its totient is φ = 390538084560.

The previous prime is 391191158861. The next prime is 391191158881. The reversal of 391191158879 is 978851191193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391191158879 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 (391191158179) 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, 326536262 + ... + 326537459.

It is an arithmetic number, because the mean of its divisors is an integer number (97961058300).

Almost surely, 2^391191158879 is an apocalyptic number.

391191158879 is a deficient number, since it is larger than the sum of its proper divisors (653074321).

391191158879 is an equidigital number, since it uses as much as digits as its factorization.

391191158879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653074320.

The product of its digits is 4898880, while the sum is 62.

The spelling of 391191158879 in words is "three hundred ninety-one billion, one hundred ninety-one million, one hundred fifty-eight thousand, eight hundred seventy-nine".