985991173 has 2 divisors, whose sum is σ = 985991174. Its totient is φ = 985991172.

The previous prime is 985991159. The next prime is 985991221. The reversal of 985991173 is 371199589.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633377889 + 352613284 = 25167^2 + 18778^2 .

It is an emirp because it is prime and its reverse (371199589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985991173 - 2⁵ = 985991141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 985991173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985991273) 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, 492995586 + 492995587.

It is an arithmetic number, because the mean of its divisors is an integer number (492995587).

Almost surely, 2^985991173 is an apocalyptic number.

It is an amenable number.

985991173 is a deficient number, since it is larger than the sum of its proper divisors (1).

985991173 is an equidigital number, since it uses as much as digits as its factorization.

985991173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 52.

The square root of 985991173 is about 31400.4963814268. The cubic root of 985991173 is about 995.3084144471.

The spelling of 985991173 in words is "nine hundred eighty-five million, nine hundred ninety-one thousand, one hundred seventy-three".