679544813 has 2 divisors, whose sum is σ = 679544814. Its totient is φ = 679544812.

The previous prime is 679544779. The next prime is 679544839. The reversal of 679544813 is 318445976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 679227844 + 316969 = 26062^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 679544813 - 2²⁸ = 411109357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679544863) 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, 339772406 + 339772407.

It is an arithmetic number, because the mean of its divisors is an integer number (339772407).

Almost surely, 2^679544813 is an apocalyptic number.

It is an amenable number.

679544813 is a deficient number, since it is larger than the sum of its proper divisors (1).

679544813 is an equidigital number, since it uses as much as digits as its factorization.

679544813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 679544813 is about 26068.0803474287. The cubic root of 679544813 is about 879.1696769372.

The spelling of 679544813 in words is "six hundred seventy-nine million, five hundred forty-four thousand, eight hundred thirteen".