13204661 has 2 divisors, whose sum is σ = 13204662. Its totient is φ = 13204660.

The previous prime is 13204649. The next prime is 13204673. The reversal of 13204661 is 16640231.

13204661 = 2569² + 2570².

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (13204649) and next prime (13204673).

It can be written as a sum of positive squares in only one way, i.e., 6604900 + 6599761 = 2570^2 + 2569^2 .

It is an emirp because it is prime and its reverse (16640231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13204661 - 2¹⁰ = 13203637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13204361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6602330 + 6602331.

It is an arithmetic number, because the mean of its divisors is an integer number (6602331).

Almost surely, 2^13204661 is an apocalyptic number.

13204661 is the 2570-th centered square number.

It is an amenable number.

13204661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13204661 is an equidigital number, since it uses as much as digits as its factorization.

13204661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13204661 is about 3633.8218173158. The cubic root of 13204661 is about 236.3609637092.

Adding to 13204661 its reverse (16640231), we get a palindrome (29844892).

The spelling of 13204661 in words is "thirteen million, two hundred four thousand, six hundred sixty-one".