391914317 has 2 divisors, whose sum is σ = 391914318. Its totient is φ = 391914316.

The previous prime is 391914301. The next prime is 391914331. The reversal of 391914317 is 713419193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355360201 + 36554116 = 18851^2 + 6046^2 .

It is an emirp because it is prime and its reverse (713419193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391914317 - 2⁴ = 391914301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391914337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195957158 + 195957159.

It is an arithmetic number, because the mean of its divisors is an integer number (195957159).

Almost surely, 2^391914317 is an apocalyptic number.

It is an amenable number.

391914317 is a deficient number, since it is larger than the sum of its proper divisors (1).

391914317 is an equidigital number, since it uses as much as digits as its factorization.

391914317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 391914317 is about 19796.8259324570. The cubic root of 391914317 is about 731.8078149402.

The spelling of 391914317 in words is "three hundred ninety-one million, nine hundred fourteen thousand, three hundred seventeen".