13216641 has 4 divisors (see below), whose sum is σ = 17622192. Its totient is φ = 8811092.

The previous prime is 13216639. The next prime is 13216661. The reversal of 13216641 is 14661231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13216641 - 2¹ = 13216639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13216601) 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, 2202771 + ... + 2202776.

It is an arithmetic number, because the mean of its divisors is an integer number (4405548).

Almost surely, 2^13216641 is an apocalyptic number.

It is an amenable number.

13216641 is a deficient number, since it is larger than the sum of its proper divisors (4405551).

13216641 is an equidigital number, since it uses as much as digits as its factorization.

13216641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405550.

The product of its digits is 864, while the sum is 24.

The square root of 13216641 is about 3635.4698458384. The cubic root of 13216641 is about 236.4324220235.

Adding to 13216641 its reverse (14661231), we get a palindrome (27877872).

The spelling of 13216641 in words is "thirteen million, two hundred sixteen thousand, six hundred forty-one".