13668517 has 2 divisors, whose sum is σ = 13668518. Its totient is φ = 13668516.

The previous prime is 13668497. The next prime is 13668521. The reversal of 13668517 is 71586631.

13668517 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., 12952801 + 715716 = 3599^2 + 846^2 .

It is an emirp because it is prime and its reverse (71586631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13668517 - 2²³ = 5279909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13668547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6834258 + 6834259.

It is an arithmetic number, because the mean of its divisors is an integer number (6834259).

Almost surely, 2^13668517 is an apocalyptic number.

It is an amenable number.

13668517 is a deficient number, since it is larger than the sum of its proper divisors (1).

13668517 is an equidigital number, since it uses as much as digits as its factorization.

13668517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 13668517 is about 3697.0957520735. The cubic root of 13668517 is about 239.0968194880.

The spelling of 13668517 in words is "thirteen million, six hundred sixty-eight thousand, five hundred seventeen".