13615121 has 4 divisors (see below), whose sum is σ = 14662452. Its totient is φ = 12567792.

The previous prime is 13615111. The next prime is 13615141. The reversal of 13615121 is 12151631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12151631 = 103 ⋅117977.

It can be written as a sum of positive squares in 2 ways, for example, as 1809025 + 11806096 = 1345^2 + 3436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13615121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13615093 and 13615102.

It is not an unprimeable number, because it can be changed into a prime (13615111) 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, 523646 + ... + 523671.

It is an arithmetic number, because the mean of its divisors is an integer number (3665613).

Almost surely, 2^13615121 is an apocalyptic number.

It is an amenable number.

13615121 is a deficient number, since it is larger than the sum of its proper divisors (1047331).

13615121 is a wasteful number, since it uses less digits than its factorization.

13615121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047330.

The product of its digits is 180, while the sum is 20.

The square root of 13615121 is about 3689.8673417889. The cubic root of 13615121 is about 238.7850696362.

Adding to 13615121 its reverse (12151631), we get a palindrome (25766752).

The spelling of 13615121 in words is "thirteen million, six hundred fifteen thousand, one hundred twenty-one".