985891169 has 2 divisors, whose sum is σ = 985891170. Its totient is φ = 985891168.

The previous prime is 985891139. The next prime is 985891201. The reversal of 985891169 is 961198589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739024225 + 246866944 = 27185^2 + 15712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985891169 is a prime.

It is a super-2 number, since 2×985891169² = 1943962794224373122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (985891139) 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, 492945584 + 492945585.

It is an arithmetic number, because the mean of its divisors is an integer number (492945585).

Almost surely, 2^985891169 is an apocalyptic number.

It is an amenable number.

985891169 is a deficient number, since it is larger than the sum of its proper divisors (1).

985891169 is an equidigital number, since it uses as much as digits as its factorization.

985891169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 56.

The square root of 985891169 is about 31398.9039458386. The cubic root of 985891169 is about 995.2747636428.

The spelling of 985891169 in words is "nine hundred eighty-five million, eight hundred ninety-one thousand, one hundred sixty-nine".