9172985 has 4 divisors (see below), whose sum is σ = 11007588. Its totient is φ = 7338384.

The previous prime is 9172981. The next prime is 9173011. The reversal of 9172985 is 5892719.

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 2521744 + 6651241 = 1588^2 + 2579^2 .

It is a cyclic number.

It is not a de Polignac number, because 9172985 - 2² = 9172981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9172981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917294 + ... + 917303.

It is an arithmetic number, because the mean of its divisors is an integer number (2751897).

Almost surely, 2^9172985 is an apocalyptic number.

It is an amenable number.

9172985 is a deficient number, since it is larger than the sum of its proper divisors (1834603).

9172985 is a wasteful number, since it uses less digits than its factorization.

9172985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834602.

The product of its digits is 45360, while the sum is 41.

The square root of 9172985 is about 3028.6936127644. The cubic root of 9172985 is about 209.3326129388.

The spelling of 9172985 in words is "nine million, one hundred seventy-two thousand, nine hundred eighty-five".