9945217 has 6 divisors (see below), whose sum is σ = 10120178. Its totient is φ = 9773232.

The previous prime is 9945211. The next prime is 9945233. The reversal of 9945217 is 7125499.

It can be written as a sum of positive squares in only one way, i.e., 9054081 + 891136 = 3009^2 + 944^2 .

It is not a de Polignac number, because 9945217 - 2³ = 9945209 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9945211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2053 + ... + 4909.

Almost surely, 2^9945217 is an apocalyptic number.

It is an amenable number.

9945217 is a deficient number, since it is larger than the sum of its proper divisors (174961).

9945217 is an equidigital number, since it uses as much as digits as its factorization.

9945217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975 (or 2916 counting only the distinct ones).

The product of its digits is 22680, while the sum is 37.

The square root of 9945217 is about 3153.6038115147. The cubic root of 9945217 is about 215.0493270632.

The spelling of 9945217 in words is "nine million, nine hundred forty-five thousand, two hundred seventeen".