818139713 has 4 divisors (see below), whose sum is σ = 818208900. Its totient is φ = 818070528.

The previous prime is 818139701. The next prime is 818139719. The reversal of 818139713 is 317931818.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 317931818 = 2 ⋅158965909.

It can be written as a sum of positive squares in 2 ways, for example, as 691532209 + 126607504 = 26297^2 + 11252^2 .

It is a cyclic number.

It is not a de Polignac number, because 818139713 - 2¹⁴ = 818123329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818139719) 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, 11888 + ... + 42161.

It is an arithmetic number, because the mean of its divisors is an integer number (204552225).

Almost surely, 2^818139713 is an apocalyptic number.

It is an amenable number.

818139713 is a deficient number, since it is larger than the sum of its proper divisors (69187).

818139713 is a wasteful number, since it uses less digits than its factorization.

818139713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69186.

The product of its digits is 36288, while the sum is 41.

The square root of 818139713 is about 28603.1416631111. The cubic root of 818139713 is about 935.2818173055.

The spelling of 818139713 in words is "eight hundred eighteen million, one hundred thirty-nine thousand, seven hundred thirteen".