391113091 has 8 divisors (see below), whose sum is σ = 408556800. Its totient is φ = 373705992.

The previous prime is 391113083. The next prime is 391113097. The reversal of 391113091 is 190311193.

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

It is a cyclic number.

It is not a de Polignac number, because 391113091 - 2³ = 391113083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391113097) 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, 13960 + ... + 31258.

It is an arithmetic number, because the mean of its divisors is an integer number (51069600).

Almost surely, 2^391113091 is an apocalyptic number.

391113091 is a deficient number, since it is larger than the sum of its proper divisors (17443709).

391113091 is a wasteful number, since it uses less digits than its factorization.

391113091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18305.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 391113091 is about 19776.5793553890. The cubic root of 391113091 is about 731.3087743345.

The spelling of 391113091 in words is "three hundred ninety-one million, one hundred thirteen thousand, ninety-one".