6856549313 has 2 divisors, whose sum is σ = 6856549314. Its totient is φ = 6856549312.

The previous prime is 6856549303. The next prime is 6856549333. The reversal of 6856549313 is 3139456586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6581752384 + 274796929 = 81128^2 + 16577^2 .

It is a cyclic number.

It is not a de Polignac number, because 6856549313 - 2¹⁸ = 6856287169 is a prime.

It is not a weakly prime, because it can be changed into another prime (6856549303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428274656 + 3428274657.

It is an arithmetic number, because the mean of its divisors is an integer number (3428274657).

Almost surely, 2^6856549313 is an apocalyptic number.

It is an amenable number.

6856549313 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856549313 is an equidigital number, since it uses as much as digits as its factorization.

6856549313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 50.

The square root of 6856549313 is about 82804.2831802800. The cubic root of 6856549313 is about 1899.7736861560.

The spelling of 6856549313 in words is "six billion, eight hundred fifty-six million, five hundred forty-nine thousand, three hundred thirteen".