13118813 has 4 divisors (see below), whose sum is σ = 13140828. Its totient is φ = 13096800.

The previous prime is 13118779. The next prime is 13118837. The reversal of 13118813 is 31881131.

13118813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31881131 = 727 ⋅43853.

It can be written as a sum of positive squares in 2 ways, for example, as 917764 + 12201049 = 958^2 + 3493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13118813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13118213) 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, 10088 + ... + 11313.

It is an arithmetic number, because the mean of its divisors is an integer number (3285207).

Almost surely, 2^13118813 is an apocalyptic number.

It is an amenable number.

13118813 is a deficient number, since it is larger than the sum of its proper divisors (22015).

13118813 is an equidigital number, since it uses as much as digits as its factorization.

13118813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22014.

The product of its digits is 576, while the sum is 26.

The square root of 13118813 is about 3621.9901987719. The cubic root of 13118813 is about 235.8476285901.

Adding to 13118813 its reverse (31881131), we get a palindrome (44999944).

It can be divided in two parts, 13118 and 813, that added together give a palindrome (13931).

The spelling of 13118813 in words is "thirteen million, one hundred eighteen thousand, eight hundred thirteen".