6393691 has 2 divisors, whose sum is σ = 6393692. Its totient is φ = 6393690.

The previous prime is 6393661. The next prime is 6393731. The reversal of 6393691 is 1963936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6393691 - 2¹⁵ = 6360923 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6393691.

It is not a weakly prime, because it can be changed into another prime (6393641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3196845 + 3196846.

It is an arithmetic number, because the mean of its divisors is an integer number (3196846).

Almost surely, 2^6393691 is an apocalyptic number.

6393691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6393691 is an equidigital number, since it uses as much as digits as its factorization.

6393691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 37.

The square root of 6393691 is about 2528.5748950743. The cubic root of 6393691 is about 185.6025254035.

The spelling of 6393691 in words is "six million, three hundred ninety-three thousand, six hundred ninety-one".