6858981949 has 2 divisors, whose sum is σ = 6858981950. Its totient is φ = 6858981948.

The previous prime is 6858981923. The next prime is 6858981953. The reversal of 6858981949 is 9491898586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4354680100 + 2504301849 = 65990^2 + 50043^2 .

It is a cyclic number.

It is not a de Polignac number, because 6858981949 - 2⁵ = 6858981917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6858981919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3429490974 + 3429490975.

It is an arithmetic number, because the mean of its divisors is an integer number (3429490975).

Almost surely, 2^6858981949 is an apocalyptic number.

It is an amenable number.

6858981949 is a deficient number, since it is larger than the sum of its proper divisors (1).

6858981949 is an equidigital number, since it uses as much as digits as its factorization.

6858981949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44789760, while the sum is 67.

The square root of 6858981949 is about 82818.9709486903. The cubic root of 6858981949 is about 1899.9983332395.

The spelling of 6858981949 in words is "six billion, eight hundred fifty-eight million, nine hundred eighty-one thousand, nine hundred forty-nine".