844387013 has 2 divisors, whose sum is σ = 844387014. Its totient is φ = 844387012.

The previous prime is 844386989. The next prime is 844387039. The reversal of 844387013 is 310783448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 843205444 + 1181569 = 29038^2 + 1087^2 .

It is a cyclic number.

It is not a de Polignac number, because 844387013 - 2⁸ = 844386757 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844380013) 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, 422193506 + 422193507.

It is an arithmetic number, because the mean of its divisors is an integer number (422193507).

Almost surely, 2^844387013 is an apocalyptic number.

It is an amenable number.

844387013 is a deficient number, since it is larger than the sum of its proper divisors (1).

844387013 is an equidigital number, since it uses as much as digits as its factorization.

844387013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 844387013 is about 29058.3380976958. The cubic root of 844387013 is about 945.1785308861.

The spelling of 844387013 in words is "eight hundred forty-four million, three hundred eighty-seven thousand, thirteen".