13604121 has 6 divisors (see below), whose sum is σ = 19650410. Its totient is φ = 9069408.

The previous prime is 13604117. The next prime is 13604167. The reversal of 13604121 is 12140631.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13286025 + 318096 = 3645^2 + 564^2 .

It is not a de Polignac number, because 13604121 - 2² = 13604117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13604094 and 13604103.

It is not an unprimeable number, because it can be changed into a prime (13604111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 755776 + ... + 755793.

Almost surely, 2^13604121 is an apocalyptic number.

It is an amenable number.

13604121 is a deficient number, since it is larger than the sum of its proper divisors (6046289).

13604121 is a wasteful number, since it uses less digits than its factorization.

13604121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511575 (or 1511572 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 13604121 is about 3688.3764721080. The cubic root of 13604121 is about 238.7207454813.

Adding to 13604121 its reverse (12140631), we get a palindrome (25744752).

The spelling of 13604121 in words is "thirteen million, six hundred four thousand, one hundred twenty-one".