679309 has 2 divisors, whose sum is σ = 679310. Its totient is φ = 679308.

The previous prime is 679297. The next prime is 679319. The reversal of 679309 is 903976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635209 + 44100 = 797^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 679309 - 2⁵ = 679277 is a prime.

It is a super-2 number, since 2×679309² = 922921434962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339654 + 339655.

It is an arithmetic number, because the mean of its divisors is an integer number (339655).

2⁶⁷⁹³⁰⁹ is an apocalyptic number.

It is an amenable number.

679309 is a deficient number, since it is larger than the sum of its proper divisors (1).

679309 is an equidigital number, since it uses as much as digits as its factorization.

679309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 679309 is about 824.2020383377. The cubic root of 679309 is about 87.9067969823.

The spelling of 679309 in words is "six hundred seventy-nine thousand, three hundred nine".