6839393621 has 2 divisors, whose sum is σ = 6839393622. Its totient is φ = 6839393620.

The previous prime is 6839393581. The next prime is 6839393629. The reversal of 6839393621 is 1263939386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6393761521 + 445632100 = 79961^2 + 21110^2 .

It is a cyclic number.

It is not a de Polignac number, because 6839393621 - 2³⁰ = 5765651797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6839393621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6839393629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3419696810 + 3419696811.

It is an arithmetic number, because the mean of its divisors is an integer number (3419696811).

Almost surely, 2^6839393621 is an apocalyptic number.

It is an amenable number.

6839393621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6839393621 is an equidigital number, since it uses as much as digits as its factorization.

6839393621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 50.

The square root of 6839393621 is about 82700.6264849306. The cubic root of 6839393621 is about 1898.1878956356.

The spelling of 6839393621 in words is "six billion, eight hundred thirty-nine million, three hundred ninety-three thousand, six hundred twenty-one".