813774681 has 14 divisors (see below), whose sum is σ = 1220104970. Its totient is φ = 542515968.

The previous prime is 813774679. The next prime is 813774691. The reversal of 813774681 is 186477318.

It can be written as a sum of positive squares in only one way, i.e., 637310025 + 176464656 = 25245^2 + 13284^2 .

It is not a de Polignac number, because 813774681 - 2¹ = 813774679 is a prime.

It is a super-2 number, since 2×813774681² = 1324458462873303522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813774631) 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 13 ways as a sum of consecutive naturals, for example, 557416 + ... + 558873.

It is an arithmetic number, because the mean of its divisors is an integer number (87150355).

Almost surely, 2^813774681 is an apocalyptic number.

813774681 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

813774681 is a deficient number, since it is larger than the sum of its proper divisors (406330289).

813774681 is an equidigital number, since it uses as much as digits as its factorization.

813774681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116307 (or 1116292 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 813774681 is about 28526.7362486493. The cubic root of 813774681 is about 933.6155097343.

The spelling of 813774681 in words is "eight hundred thirteen million, seven hundred seventy-four thousand, six hundred eighty-one".