813835285 has 8 divisors (see below), whose sum is σ = 977267160. Its totient is φ = 650625024.

The previous prime is 813835283. The next prime is 813835307. The reversal of 813835285 is 582538318.

It can be written as a sum of positive squares in 4 ways, for example, as 11303044 + 802532241 = 3362^2 + 28329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 813835285 - 2¹ = 813835283 is a prime.

It is a super-2 number, since 2×813835285² = 1324655742222062450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813835283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47212 + ... + 62101.

It is an arithmetic number, because the mean of its divisors is an integer number (122158395).

Almost surely, 2^813835285 is an apocalyptic number.

It is an amenable number.

813835285 is a deficient number, since it is larger than the sum of its proper divisors (163431875).

813835285 is a wasteful number, since it uses less digits than its factorization.

813835285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110807.

The product of its digits is 230400, while the sum is 43.

The square root of 813835285 is about 28527.7984604491. The cubic root of 813835285 is about 933.6386854492.

It can be divided in two parts, 81383 and 5285, that added together give a palindrome (86668).

The spelling of 813835285 in words is "eight hundred thirteen million, eight hundred thirty-five thousand, two hundred eighty-five".