6856381339 has 2 divisors, whose sum is σ = 6856381340. Its totient is φ = 6856381338.

The previous prime is 6856381331. The next prime is 6856381369. The reversal of 6856381339 is 9331836586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6856381339 - 2³ = 6856381331 is a prime.

It is not a weakly prime, because it can be changed into another prime (6856381331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428190669 + 3428190670.

It is an arithmetic number, because the mean of its divisors is an integer number (3428190670).

Almost surely, 2^6856381339 is an apocalyptic number.

6856381339 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856381339 is an equidigital number, since it uses as much as digits as its factorization.

6856381339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 52.

The square root of 6856381339 is about 82803.2688907872. The cubic root of 6856381339 is about 1899.7581722691.

The spelling of 6856381339 in words is "six billion, eight hundred fifty-six million, three hundred eighty-one thousand, three hundred thirty-nine".