13616321 has 2 divisors, whose sum is σ = 13616322. Its totient is φ = 13616320.

The previous prime is 13616297. The next prime is 13616329. The reversal of 13616321 is 12361631.

It is a happy number.

13616321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12503296 + 1113025 = 3536^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 13616321 - 2⁶ = 13616257 is a prime.

It is not a weakly prime, because it can be changed into another prime (13616329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6808160 + 6808161.

It is an arithmetic number, because the mean of its divisors is an integer number (6808161).

Almost surely, 2^13616321 is an apocalyptic number.

It is an amenable number.

13616321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13616321 is an equidigital number, since it uses as much as digits as its factorization.

13616321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

The square root of 13616321 is about 3690.0299456779. The cubic root of 13616321 is about 238.7920847205.

Adding to 13616321 its reverse (12361631), we get a palindrome (25977952).

The spelling of 13616321 in words is "thirteen million, six hundred sixteen thousand, three hundred twenty-one".