679444013 has 2 divisors, whose sum is σ = 679444014. Its totient is φ = 679444012.

The previous prime is 679443997. The next prime is 679444039. The reversal of 679444013 is 310444976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 451222564 + 228221449 = 21242^2 + 15107^2 .

It is a cyclic number.

It is not a de Polignac number, because 679444013 - 2⁴ = 679443997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679444043) 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, 339722006 + 339722007.

It is an arithmetic number, because the mean of its divisors is an integer number (339722007).

Almost surely, 2^679444013 is an apocalyptic number.

It is an amenable number.

679444013 is a deficient number, since it is larger than the sum of its proper divisors (1).

679444013 is an equidigital number, since it uses as much as digits as its factorization.

679444013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 679444013 is about 26066.1468767442. The cubic root of 679444013 is about 879.1262043636.

Adding to 679444013 its reverse (310444976), we get a palindrome (989888989).

The spelling of 679444013 in words is "six hundred seventy-nine million, four hundred forty-four thousand, thirteen".