13489921 has 2 divisors, whose sum is σ = 13489922. Its totient is φ = 13489920.

The previous prime is 13489919. The next prime is 13489963. The reversal of 13489921 is 12998431.

13489921 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., 13424896 + 65025 = 3664^2 + 255^2 .

It is an emirp because it is prime and its reverse (12998431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13489921 - 2¹ = 13489919 is a prime.

Together with 13489919, 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 (13489121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6744960 + 6744961.

It is an arithmetic number, because the mean of its divisors is an integer number (6744961).

Almost surely, 2^13489921 is an apocalyptic number.

It is an amenable number.

13489921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13489921 is an equidigital number, since it uses as much as digits as its factorization.

13489921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 13489921 is about 3672.8627799034. The cubic root of 13489921 is about 238.0508859488.

The spelling of 13489921 in words is "thirteen million, four hundred eighty-nine thousand, nine hundred twenty-one".