13891817 has 2 divisors, whose sum is σ = 13891818. Its totient is φ = 13891816.

The previous prime is 13891811. The next prime is 13891819. The reversal of 13891817 is 71819831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11689561 + 2202256 = 3419^2 + 1484^2 .

It is an emirp because it is prime and its reverse (71819831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13891817 - 2¹⁸ = 13629673 is a prime.

It is a super-2 number, since 2×13891817² = 385965159122978, which contains 22 as substring.

Together with 13891819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13891811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945908 + 6945909.

It is an arithmetic number, because the mean of its divisors is an integer number (6945909).

Almost surely, 2^13891817 is an apocalyptic number.

It is an amenable number.

13891817 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891817 is an equidigital number, since it uses as much as digits as its factorization.

13891817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 38.

The square root of 13891817 is about 3727.1727891258. The cubic root of 13891817 is about 240.3918194656.

The spelling of 13891817 in words is "thirteen million, eight hundred ninety-one thousand, eight hundred seventeen".