13872517 has 2 divisors, whose sum is σ = 13872518. Its totient is φ = 13872516.

The previous prime is 13872511. The next prime is 13872533. The reversal of 13872517 is 71527831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11655396 + 2217121 = 3414^2 + 1489^2 .

It is an emirp because it is prime and its reverse (71527831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13872517 - 2²³ = 5483909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13872511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6936258 + 6936259.

It is an arithmetic number, because the mean of its divisors is an integer number (6936259).

Almost surely, 2^13872517 is an apocalyptic number.

It is an amenable number.

13872517 is a deficient number, since it is larger than the sum of its proper divisors (1).

13872517 is an equidigital number, since it uses as much as digits as its factorization.

13872517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 13872517 is about 3724.5827954282. The cubic root of 13872517 is about 240.2804418498.

The spelling of 13872517 in words is "thirteen million, eight hundred seventy-two thousand, five hundred seventeen".