985085819 has 2 divisors, whose sum is σ = 985085820. Its totient is φ = 985085818.

The previous prime is 985085789. The next prime is 985085861. The reversal of 985085819 is 918580589.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985085819 is a prime.

It is a super-2 number, since 2×985085819² = 1940788141589801522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (985085869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492542909 + 492542910.

It is an arithmetic number, because the mean of its divisors is an integer number (492542910).

Almost surely, 2^985085819 is an apocalyptic number.

985085819 is a deficient number, since it is larger than the sum of its proper divisors (1).

985085819 is an equidigital number, since it uses as much as digits as its factorization.

985085819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 53.

The square root of 985085819 is about 31386.0768335260. The cubic root of 985085819 is about 995.0036847418.

The spelling of 985085819 in words is "nine hundred eighty-five million, eighty-five thousand, eight hundred nineteen".