985563217 has 4 divisors (see below), whose sum is σ = 985627300. Its totient is φ = 985499136.

The previous prime is 985563209. The next prime is 985563251. The reversal of 985563217 is 712365589.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 126135361 + 859427856 = 11231^2 + 29316^2 .

It is a 3-Lehmer number, since φ(985563217) divides (985563217-1)³.

It is a cyclic number.

It is not a de Polignac number, because 985563217 - 2³ = 985563209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985563517) 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, 6409 + ... + 44857.

It is an arithmetic number, because the mean of its divisors is an integer number (246406825).

Almost surely, 2^985563217 is an apocalyptic number.

985563217 is the 25633-rd pentagonal number.

It is an amenable number.

985563217 is a deficient number, since it is larger than the sum of its proper divisors (64083).

985563217 is a wasteful number, since it uses less digits than its factorization.

985563217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64082.

The product of its digits is 453600, while the sum is 46.

The square root of 985563217 is about 31393.6811635718. The cubic root of 985563217 is about 995.1643936012.

The spelling of 985563217 in words is "nine hundred eighty-five million, five hundred sixty-three thousand, two hundred seventeen".