810346681 has 4 divisors (see below), whose sum is σ = 838289700. Its totient is φ = 782403664.

The previous prime is 810346661. The next prime is 810346697. The reversal of 810346681 is 186643018.

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 620458281 + 189888400 = 24909^2 + 13780^2 .

It is a cyclic number.

It is not a de Polignac number, because 810346681 - 2²⁵ = 776792249 is a prime.

It is a super-2 number, since 2×810346681² = 1313323486815431522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 810346681.

It is not an unprimeable number, because it can be changed into a prime (810346661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13971466 + ... + 13971523.

It is an arithmetic number, because the mean of its divisors is an integer number (209572425).

Almost surely, 2^810346681 is an apocalyptic number.

It is an amenable number.

810346681 is a deficient number, since it is larger than the sum of its proper divisors (27943019).

810346681 is a wasteful number, since it uses less digits than its factorization.

810346681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27943018.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 810346681 is about 28466.5888543043. The cubic root of 810346681 is about 932.3027227522.

Adding to 810346681 its reverse (186643018), we get a palindrome (996989699).

The spelling of 810346681 in words is "eight hundred ten million, three hundred forty-six thousand, six hundred eighty-one".