679906613 has 2 divisors, whose sum is σ = 679906614. Its totient is φ = 679906612.

The previous prime is 679906603. The next prime is 679906639. The reversal of 679906613 is 316609976.

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., 640241809 + 39664804 = 25303^2 + 6298^2 .

It is a cyclic number.

It is not a de Polignac number, because 679906613 - 2¹⁴ = 679890229 is a prime.

It is a super-2 number, since 2×679906613² = 924546004802263538, which contains 22 as substring.

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 (679906603) 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, 339953306 + 339953307.

It is an arithmetic number, because the mean of its divisors is an integer number (339953307).

Almost surely, 2^679906613 is an apocalyptic number.

It is an amenable number.

679906613 is a deficient number, since it is larger than the sum of its proper divisors (1).

679906613 is an equidigital number, since it uses as much as digits as its factorization.

679906613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 679906613 is about 26075.0189453431. The cubic root of 679906613 is about 879.3256770267.

The spelling of 679906613 in words is "six hundred seventy-nine million, nine hundred six thousand, six hundred thirteen".