13617321 has 16 divisors (see below), whose sum is σ = 18530304. Its totient is φ = 8893584.

The previous prime is 13617313. The next prime is 13617337. The reversal of 13617321 is 12371631.

It is not a de Polignac number, because 13617321 - 2³ = 13617313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13617291 and 13617300.

It is not an unprimeable number, because it can be changed into a prime (13617301) 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 15 ways as a sum of consecutive naturals, for example, 39070 + ... + 39416.

It is an arithmetic number, because the mean of its divisors is an integer number (1158144).

Almost surely, 2^13617321 is an apocalyptic number.

It is an amenable number.

13617321 is a deficient number, since it is larger than the sum of its proper divisors (4912983).

13617321 is a wasteful number, since it uses less digits than its factorization.

13617321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580.

The product of its digits is 756, while the sum is 24.

The square root of 13617321 is about 3690.1654434456. The cubic root of 13617321 is about 238.7979303093.

Adding to 13617321 its reverse (12371631), we get a palindrome (25988952).

The spelling of 13617321 in words is "thirteen million, six hundred seventeen thousand, three hundred twenty-one".