8172085 has 4 divisors (see below), whose sum is σ = 9806508. Its totient is φ = 6537664.

The previous prime is 8172083. The next prime is 8172089. The reversal of 8172085 is 5802718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5802718 = 2 ⋅2901359.

It can be written as a sum of positive squares in 2 ways, for example, as 6115729 + 2056356 = 2473^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172085 - 2¹ = 8172083 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8172083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817204 + ... + 817213.

It is an arithmetic number, because the mean of its divisors is an integer number (2451627).

Almost surely, 2^8172085 is an apocalyptic number.

It is an amenable number.

8172085 is a deficient number, since it is larger than the sum of its proper divisors (1634423).

8172085 is a wasteful number, since it uses less digits than its factorization.

8172085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634422.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 8172085 is about 2858.6858869068. The cubic root of 8172085 is about 201.4238804324.

The spelling of 8172085 in words is "eight million, one hundred seventy-two thousand, eighty-five".