13608121 has 4 divisors (see below), whose sum is σ = 13864932. Its totient is φ = 13351312.

The previous prime is 13608113. The next prime is 13608131. The reversal of 13608121 is 12180631.

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 8202496 + 5405625 = 2864^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 13608121 - 2³ = 13608113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13608092 and 13608101.

It is not an unprimeable number, because it can be changed into a prime (13608131) 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, 128326 + ... + 128431.

It is an arithmetic number, because the mean of its divisors is an integer number (3466233).

Almost surely, 2^13608121 is an apocalyptic number.

It is an amenable number.

13608121 is a deficient number, since it is larger than the sum of its proper divisors (256811).

13608121 is an equidigital number, since it uses as much as digits as its factorization.

13608121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256810.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 13608121 is about 3688.9186762519. The cubic root of 13608121 is about 238.7441400936.

Adding to 13608121 its reverse (12180631), we get a palindrome (25788752).

The spelling of 13608121 in words is "thirteen million, six hundred eight thousand, one hundred twenty-one".