6391717 has 2 divisors, whose sum is σ = 6391718. Its totient is φ = 6391716.

The previous prime is 6391699. The next prime is 6391727. The reversal of 6391717 is 7171936.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3290596 + 3101121 = 1814^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 6391717 - 2⁷ = 6391589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6391727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195858 + 3195859.

It is an arithmetic number, because the mean of its divisors is an integer number (3195859).

Almost surely, 2^6391717 is an apocalyptic number.

It is an amenable number.

6391717 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391717 is an equidigital number, since it uses as much as digits as its factorization.

6391717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 34.

The square root of 6391717 is about 2528.1845264933. The cubic root of 6391717 is about 185.5834223482.

The spelling of 6391717 in words is "six million, three hundred ninety-one thousand, seven hundred seventeen".