679645129 has 4 divisors (see below), whose sum is σ = 692468676. Its totient is φ = 666821584.

The previous prime is 679645121. The next prime is 679645163. The reversal of 679645129 is 921546976.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 563587600 + 116057529 = 23740^2 + 10773^2 .

It is a cyclic number.

It is not a de Polignac number, because 679645129 - 2³ = 679645121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679645121) 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 in 3 ways as a sum of consecutive naturals, for example, 6411694 + ... + 6411799.

It is an arithmetic number, because the mean of its divisors is an integer number (173117169).

Almost surely, 2^679645129 is an apocalyptic number.

It is an amenable number.

679645129 is a deficient number, since it is larger than the sum of its proper divisors (12823547).

679645129 is a wasteful number, since it uses less digits than its factorization.

679645129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12823546.

The product of its digits is 816480, while the sum is 49.

The square root of 679645129 is about 26070.0043920211. The cubic root of 679645129 is about 879.2129365055.

The spelling of 679645129 in words is "six hundred seventy-nine million, six hundred forty-five thousand, one hundred twenty-nine".