13621889 has 2 divisors, whose sum is σ = 13621890. Its totient is φ = 13621888.

The previous prime is 13621871. The next prime is 13621903. The reversal of 13621889 is 98812631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10291264 + 3330625 = 3208^2 + 1825^2 .

It is an emirp because it is prime and its reverse (98812631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13621889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13621189) 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, 6810944 + 6810945.

It is an arithmetic number, because the mean of its divisors is an integer number (6810945).

Almost surely, 2^13621889 is an apocalyptic number.

It is an amenable number.

13621889 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621889 is an equidigital number, since it uses as much as digits as its factorization.

13621889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 13621889 is about 3690.7843339865. The cubic root of 13621889 is about 238.8246293199.

The spelling of 13621889 in words is "thirteen million, six hundred twenty-one thousand, eight hundred eighty-nine".