13539882321 has 45 divisors (see below), whose sum is σ = 23541233529. Its totient is φ = 7732886616.

The previous prime is 13539882313. The next prime is 13539882331. The reversal of 13539882321 is 12328893531.

The square root of 13539882321 is 116361.

It is a perfect power (a square), and thus also a powerful number.

13539882321 is a `hidden beast` number, since 1 + 3 + 539 + 8 + 82 + 32 + 1 = 666.

It is not a de Polignac number, because 13539882321 - 2³ = 13539882313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13539882331) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7329820 + ... + 7331666.

Almost surely, 2^13539882321 is an apocalyptic number.

13539882321 is the 116361-st square number.

13539882321 is the 58181-st centered octagonal number.

It is an amenable number.

13539882321 is a deficient number, since it is larger than the sum of its proper divisors (10001351208).

13539882321 is an frugal number, since it uses more digits than its factorization.

13539882321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720 (or 1857 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 13539882321 in words is "thirteen billion, five hundred thirty-nine million, eight hundred eighty-two thousand, three hundred twenty-one".