13289621 has 4 divisors (see below), whose sum is σ = 13346892. Its totient is φ = 13232352.

The previous prime is 13289609. The next prime is 13289641. The reversal of 13289621 is 12698231.

13289621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1661521 + 11628100 = 1289^2 + 3410^2 .

It is a cyclic number.

It is not a de Polignac number, because 13289621 - 2¹⁸ = 13027477 is a prime.

It is a super-2 number, since 2×13289621² = 353228052647282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13289641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28286 + ... + 28751.

It is an arithmetic number, because the mean of its divisors is an integer number (3336723).

Almost surely, 2^13289621 is an apocalyptic number.

It is an amenable number.

13289621 is a deficient number, since it is larger than the sum of its proper divisors (57271).

13289621 is an equidigital number, since it uses as much as digits as its factorization.

13289621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57270.

The product of its digits is 5184, while the sum is 32.

The square root of 13289621 is about 3645.4932450904. The cubic root of 13289621 is about 236.8668030896.

The spelling of 13289621 in words is "thirteen million, two hundred eighty-nine thousand, six hundred twenty-one".