985694209 has 4 divisors (see below), whose sum is σ = 985784580. Its totient is φ = 985603840.

The previous prime is 985694201. The next prime is 985694219. The reversal of 985694209 is 902496589.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 902496589 = 181 ⋅4986169.

It can be written as a sum of positive squares in 2 ways, for example, as 170877184 + 814817025 = 13072^2 + 28545^2 .

It is a cyclic number.

It is not a de Polignac number, because 985694209 - 2³ = 985694201 is a prime.

It is a super-2 number, since 2×985694209² = 1943186147312271362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985694201) 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, 26152 + ... + 51529.

It is an arithmetic number, because the mean of its divisors is an integer number (246446145).

It is a Proth number, since it is equal to 30081 ⋅ 2¹⁵ + 1 and 30081 < 2¹⁵.

Almost surely, 2^985694209 is an apocalyptic number.

It is an amenable number.

985694209 is a deficient number, since it is larger than the sum of its proper divisors (90371).

985694209 is a wasteful number, since it uses less digits than its factorization.

985694209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90370.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The square root of 985694209 is about 31395.7673739630. The cubic root of 985694209 is about 995.2084810148.

The spelling of 985694209 in words is "nine hundred eighty-five million, six hundred ninety-four thousand, two hundred nine".