679979959 has 2 divisors, whose sum is σ = 679979960. Its totient is φ = 679979958.

The previous prime is 679979929. The next prime is 679979987. The reversal of 679979959 is 959979976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679979959 - 2²³ = 671591351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679979929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339989979 + 339989980.

It is an arithmetic number, because the mean of its divisors is an integer number (339989980).

Almost surely, 2^679979959 is an apocalyptic number.

679979959 is a deficient number, since it is larger than the sum of its proper divisors (1).

679979959 is an equidigital number, since it uses as much as digits as its factorization.

679979959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86802030, while the sum is 70.

The square root of 679979959 is about 26076.4253493457. The cubic root of 679979959 is about 879.3572954386.

The spelling of 679979959 in words is "six hundred seventy-nine million, nine hundred seventy-nine thousand, nine hundred fifty-nine".