679523189 has 2 divisors, whose sum is σ = 679523190. Its totient is φ = 679523188.

The previous prime is 679523177. The next prime is 679523191. The reversal of 679523189 is 981325976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391644100 + 287879089 = 19790^2 + 16967^2 .

It is a cyclic number.

It is not a de Polignac number, because 679523189 - 2²⁰ = 678474613 is a prime.

Together with 679523191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679573189) 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, 339761594 + 339761595.

It is an arithmetic number, because the mean of its divisors is an integer number (339761595).

Almost surely, 2^679523189 is an apocalyptic number.

It is an amenable number.

679523189 is a deficient number, since it is larger than the sum of its proper divisors (1).

679523189 is an equidigital number, since it uses as much as digits as its factorization.

679523189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 679523189 is about 26067.6655840142. The cubic root of 679523189 is about 879.1603513973.

The spelling of 679523189 in words is "six hundred seventy-nine million, five hundred twenty-three thousand, one hundred eighty-nine".