679985171 has 2 divisors, whose sum is σ = 679985172. Its totient is φ = 679985170.

The previous prime is 679985113. The next prime is 679985221. The reversal of 679985171 is 171589976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679985171 - 2¹⁰ = 679984147 is a prime.

It is not a weakly prime, because it can be changed into another prime (679975171) 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, 339992585 + 339992586.

It is an arithmetic number, because the mean of its divisors is an integer number (339992586).

Almost surely, 2^679985171 is an apocalyptic number.

679985171 is a deficient number, since it is larger than the sum of its proper divisors (1).

679985171 is an equidigital number, since it uses as much as digits as its factorization.

679985171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 53.

The square root of 679985171 is about 26076.5252861649. The cubic root of 679985171 is about 879.3595421707.

The spelling of 679985171 in words is "six hundred seventy-nine million, nine hundred eighty-five thousand, one hundred seventy-one".