13815317 has 2 divisors, whose sum is σ = 13815318. Its totient is φ = 13815316.

The previous prime is 13815311. The next prime is 13815331. The reversal of 13815317 is 71351831.

13815317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10182481 + 3632836 = 3191^2 + 1906^2 .

It is a cyclic number.

It is not a de Polignac number, because 13815317 - 2⁴ = 13815301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13815317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13815311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6907658 + 6907659.

It is an arithmetic number, because the mean of its divisors is an integer number (6907659).

Almost surely, 2^13815317 is an apocalyptic number.

It is an amenable number.

13815317 is a deficient number, since it is larger than the sum of its proper divisors (1).

13815317 is an equidigital number, since it uses as much as digits as its factorization.

13815317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 13815317 is about 3716.8961513607. The cubic root of 13815317 is about 239.9497406331.

The spelling of 13815317 in words is "thirteen million, eight hundred fifteen thousand, three hundred seventeen".