13938121 has 2 divisors, whose sum is σ = 13938122. Its totient is φ = 13938120.

The previous prime is 13938083. The next prime is 13938137. The reversal of 13938121 is 12183931.

13938121 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., 12960000 + 978121 = 3600^2 + 989^2 .

It is an emirp because it is prime and its reverse (12183931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13938121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13938121.

It is not a weakly prime, because it can be changed into another prime (13938151) 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, 6969060 + 6969061.

It is an arithmetic number, because the mean of its divisors is an integer number (6969061).

Almost surely, 2^13938121 is an apocalyptic number.

It is an amenable number.

13938121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13938121 is an equidigital number, since it uses as much as digits as its factorization.

13938121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 13938121 is about 3733.3793003123. The cubic root of 13938121 is about 240.6586134186.

The spelling of 13938121 in words is "thirteen million, nine hundred thirty-eight thousand, one hundred twenty-one".