985100209 has 4 divisors (see below), whose sum is σ = 987557220. Its totient is φ = 982643200.

The previous prime is 985100197. The next prime is 985100227. The reversal of 985100209 is 902001589.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 628003600 + 357096609 = 25060^2 + 18897^2 .

It is a cyclic number.

It is not a de Polignac number, because 985100209 - 2⁵ = 985100177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985104209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1227904 + ... + 1228705.

It is an arithmetic number, because the mean of its divisors is an integer number (246889305).

Almost surely, 2^985100209 is an apocalyptic number.

It is an amenable number.

985100209 is a deficient number, since it is larger than the sum of its proper divisors (2457011).

985100209 is a wasteful number, since it uses less digits than its factorization.

985100209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457010.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 985100209 is about 31386.3060744650. The cubic root of 985100209 is about 995.0085296778.

The spelling of 985100209 in words is "nine hundred eighty-five million, one hundred thousand, two hundred nine".