13205641 has 4 divisors (see below), whose sum is σ = 13213252. Its totient is φ = 13198032.

The previous prime is 13205603. The next prime is 13205653. The reversal of 13205641 is 14650231.

13205641 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14650231 = 59 ⋅248309.

It can be written as a sum of positive squares in 2 ways, for example, as 1679616 + 11526025 = 1296^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 13205641 - 2¹⁷ = 13074569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13205671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (3303313).

Almost surely, 2^13205641 is an apocalyptic number.

It is an amenable number.

13205641 is a deficient number, since it is larger than the sum of its proper divisors (7611).

13205641 is an equidigital number, since it uses as much as digits as its factorization.

13205641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 13205641 is about 3633.9566590701. The cubic root of 13205641 is about 236.3668108369.

Adding to 13205641 its reverse (14650231), we get a palindrome (27855872).

The spelling of 13205641 in words is "thirteen million, two hundred five thousand, six hundred forty-one".