13851217 has 2 divisors, whose sum is σ = 13851218. Its totient is φ = 13851216.

The previous prime is 13851193. The next prime is 13851263. The reversal of 13851217 is 71215831.

13851217 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., 12503296 + 1347921 = 3536^2 + 1161^2 .

It is an emirp because it is prime and its reverse (71215831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13851217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13851287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6925608 + 6925609.

It is an arithmetic number, because the mean of its divisors is an integer number (6925609).

Almost surely, 2^13851217 is an apocalyptic number.

It is an amenable number.

13851217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13851217 is an equidigital number, since it uses as much as digits as its factorization.

13851217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 13851217 is about 3721.7223163476. The cubic root of 13851217 is about 240.1574025330.

The spelling of 13851217 in words is "thirteen million, eight hundred fifty-one thousand, two hundred seventeen".