13115717 has 2 divisors, whose sum is σ = 13115718. Its totient is φ = 13115716.

The previous prime is 13115693. The next prime is 13115737. The reversal of 13115717 is 71751131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11082241 + 2033476 = 3329^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 13115717 - 2¹² = 13111621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13115737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6557858 + 6557859.

It is an arithmetic number, because the mean of its divisors is an integer number (6557859).

Almost surely, 2^13115717 is an apocalyptic number.

It is an amenable number.

13115717 is a deficient number, since it is larger than the sum of its proper divisors (1).

13115717 is an equidigital number, since it uses as much as digits as its factorization.

13115717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 735, while the sum is 26.

The square root of 13115717 is about 3621.5627842135. The cubic root of 13115717 is about 235.8290740226.

Adding to 13115717 its reverse (71751131), we get a palindrome (84866848).

The spelling of 13115717 in words is "thirteen million, one hundred fifteen thousand, seven hundred seventeen".