679518691 has 4 divisors (see below), whose sum is σ = 702950400. Its totient is φ = 656086984.

The previous prime is 679518661. The next prime is 679518703. The reversal of 679518691 is 196815976.

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

It is a cyclic number.

It is not a de Polignac number, because 679518691 - 2²⁹ = 142647779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (679518661) 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 in 3 ways as a sum of consecutive naturals, for example, 11715811 + ... + 11715868.

It is an arithmetic number, because the mean of its divisors is an integer number (175737600).

Almost surely, 2^679518691 is an apocalyptic number.

679518691 is a deficient number, since it is larger than the sum of its proper divisors (23431709).

679518691 is a wasteful number, since it uses less digits than its factorization.

679518691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23431708.

The product of its digits is 816480, while the sum is 52.

The square root of 679518691 is about 26067.5793084053. The cubic root of 679518691 is about 879.1584115704.

The spelling of 679518691 in words is "six hundred seventy-nine million, five hundred eighteen thousand, six hundred ninety-one".