679880909 has 2 divisors, whose sum is σ = 679880910. Its totient is φ = 679880908.

The previous prime is 679880867. The next prime is 679880921. The reversal of 679880909 is 909088976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676156009 + 3724900 = 26003^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 679880909 - 2⁸ = 679880653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679885909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339940454 + 339940455.

It is an arithmetic number, because the mean of its divisors is an integer number (339940455).

Almost surely, 2^679880909 is an apocalyptic number.

It is an amenable number.

679880909 is a deficient number, since it is larger than the sum of its proper divisors (1).

679880909 is an equidigital number, since it uses as much as digits as its factorization.

679880909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 679880909 is about 26074.5260551366. The cubic root of 679880909 is about 879.3145958617.

The spelling of 679880909 in words is "six hundred seventy-nine million, eight hundred eighty thousand, nine hundred nine".