391328911 has 2 divisors, whose sum is σ = 391328912. Its totient is φ = 391328910.

The previous prime is 391328893. The next prime is 391328947. The reversal of 391328911 is 119823193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391328911 - 2¹¹ = 391326863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391328611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195664455 + 195664456.

It is an arithmetic number, because the mean of its divisors is an integer number (195664456).

Almost surely, 2^391328911 is an apocalyptic number.

391328911 is a deficient number, since it is larger than the sum of its proper divisors (1).

391328911 is an equidigital number, since it uses as much as digits as its factorization.

391328911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 391328911 is about 19782.0350570916. The cubic root of 391328911 is about 731.4432640267.

The spelling of 391328911 in words is "three hundred ninety-one million, three hundred twenty-eight thousand, nine hundred eleven".