810085 has 4 divisors (see below), whose sum is σ = 972108. Its totient is φ = 648064.

The previous prime is 810079. The next prime is 810091. The reversal of 810085 is 580018.

810085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (810079) and next prime (810091).

It can be written as a sum of positive squares in 2 ways, for example, as 229441 + 580644 = 479^2 + 762^2 .

It is a cyclic number.

It is not a de Polignac number, because 810085 - 2⁵ = 810053 is a prime.

It is a Smith number, since the sum of its digits (22) 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81004 + ... + 81013.

It is an arithmetic number, because the mean of its divisors is an integer number (243027).

2⁸¹⁰⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

810085 is a deficient number, since it is larger than the sum of its proper divisors (162023).

810085 is a wasteful number, since it uses less digits than its factorization.

810085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162022.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 810085 is about 900.0472209834. The cubic root of 810085 is about 93.2202357407.

The spelling of 810085 in words is "eight hundred ten thousand, eighty-five".