679937309 has 2 divisors, whose sum is σ = 679937310. Its totient is φ = 679937308.

The previous prime is 679937303. The next prime is 679937329. The reversal of 679937309 is 903739976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679905625 + 31684 = 26075^2 + 178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679937309 is a prime.

It is a super-2 number, since 2×679937309² = 924629488340322962, 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 (679937303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339968654 + 339968655.

It is an arithmetic number, because the mean of its divisors is an integer number (339968655).

Almost surely, 2^679937309 is an apocalyptic number.

It is an amenable number.

679937309 is a deficient number, since it is larger than the sum of its proper divisors (1).

679937309 is an equidigital number, since it uses as much as digits as its factorization.

679937309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1928934, while the sum is 53.

The square root of 679937309 is about 26075.6075480515. The cubic root of 679937309 is about 879.3389099101.

The spelling of 679937309 in words is "six hundred seventy-nine million, nine hundred thirty-seven thousand, three hundred nine".