813228085 has 4 divisors (see below), whose sum is σ = 975873708. Its totient is φ = 650582464.

The previous prime is 813228077. The next prime is 813228109. The reversal of 813228085 is 580822318.

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 469718929 + 343509156 = 21673^2 + 18534^2 .

It is a cyclic number.

It is not a de Polignac number, because 813228085 - 2³ = 813228077 is a prime.

It is a super-2 number, since 2×813228085² = 1322679836465534450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 81322804 + ... + 81322813.

It is an arithmetic number, because the mean of its divisors is an integer number (243968427).

Almost surely, 2^813228085 is an apocalyptic number.

It is an amenable number.

813228085 is a deficient number, since it is larger than the sum of its proper divisors (162645623).

813228085 is a wasteful number, since it uses less digits than its factorization.

813228085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162645622.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 813228085 is about 28517.1542233793. The cubic root of 813228085 is about 933.4064326959.

The spelling of 813228085 in words is "eight hundred thirteen million, two hundred twenty-eight thousand, eighty-five".