985319989 has 2 divisors, whose sum is σ = 985319990. Its totient is φ = 985319988.

The previous prime is 985319947. The next prime is 985320013. The reversal of 985319989 is 989913589.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 865242225 + 120077764 = 29415^2 + 10958^2 .

It is a cyclic number.

It is not a de Polignac number, because 985319989 - 2⁷ = 985319861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985319389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492659994 + 492659995.

It is an arithmetic number, because the mean of its divisors is an integer number (492659995).

Almost surely, 2^985319989 is an apocalyptic number.

It is an amenable number.

985319989 is a deficient number, since it is larger than the sum of its proper divisors (1).

985319989 is an equidigital number, since it uses as much as digits as its factorization.

985319989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6298560, while the sum is 61.

The square root of 985319989 is about 31389.8070876519. The cubic root of 985319989 is about 995.0825210382.

The spelling of 985319989 in words is "nine hundred eighty-five million, three hundred nineteen thousand, nine hundred eighty-nine".