985104209 has 2 divisors, whose sum is σ = 985104210. Its totient is φ = 985104208.

The previous prime is 985104187. The next prime is 985104221. The reversal of 985104209 is 902401589.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787083025 + 198021184 = 28055^2 + 14072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985104209 is a prime.

It is not a weakly prime, because it can be changed into another prime (985106209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492552104 + 492552105.

It is an arithmetic number, because the mean of its divisors is an integer number (492552105).

Almost surely, 2^985104209 is an apocalyptic number.

It is an amenable number.

985104209 is a deficient number, since it is larger than the sum of its proper divisors (1).

985104209 is an equidigital number, since it uses as much as digits as its factorization.

985104209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 985104209 is about 31386.3697964578. The cubic root of 985104209 is about 995.0098764202.

The spelling of 985104209 in words is "nine hundred eighty-five million, one hundred four thousand, two hundred nine".