679528891 has 2 divisors, whose sum is σ = 679528892. Its totient is φ = 679528890.

The previous prime is 679528877. The next prime is 679528903. The reversal of 679528891 is 198825976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679528891 - 2⁹ = 679528379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (679528831) 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 as a sum of consecutive naturals, namely, 339764445 + 339764446.

It is an arithmetic number, because the mean of its divisors is an integer number (339764446).

Almost surely, 2^679528891 is an apocalyptic number.

679528891 is a deficient number, since it is larger than the sum of its proper divisors (1).

679528891 is an equidigital number, since it uses as much as digits as its factorization.

679528891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 55.

The square root of 679528891 is about 26067.7749529951. The cubic root of 679528891 is about 879.1628104540.

The spelling of 679528891 in words is "six hundred seventy-nine million, five hundred twenty-eight thousand, eight hundred ninety-one".