13115813 has 2 divisors, whose sum is σ = 13115814. Its totient is φ = 13115812.

The previous prime is 13115783. The next prime is 13115827. The reversal of 13115813 is 31851131.

13115813 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13082689 + 33124 = 3617^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 13115813 - 2¹² = 13111717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13115863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6557906 + 6557907.

It is an arithmetic number, because the mean of its divisors is an integer number (6557907).

Almost surely, 2^13115813 is an apocalyptic number.

It is an amenable number.

13115813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13115813 is an equidigital number, since it uses as much as digits as its factorization.

13115813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 13115813 is about 3621.5760381359. The cubic root of 13115813 is about 235.8296494019.

Adding to 13115813 its reverse (31851131), we get a palindrome (44966944).

The spelling of 13115813 in words is "thirteen million, one hundred fifteen thousand, eight hundred thirteen".