13247539281 has 32 divisors (see below), whose sum is σ = 19899976320. Its totient is φ = 8708801472.

The previous prime is 13247539273. The next prime is 13247539297. The reversal of 13247539281 is 18293574231.

It is a happy number.

13247539281 is a `hidden beast` number, since 1 + 32 + 4 + 7 + 539 + 2 + 81 = 666.

It is not a de Polignac number, because 13247539281 - 2³ = 13247539273 is a prime.

It is a super-2 number, since 2×13247539281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13247539211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1242931 + ... + 1253543.

It is an arithmetic number, because the mean of its divisors is an integer number (621874260).

Almost surely, 2^13247539281 is an apocalyptic number.

It is an amenable number.

13247539281 is a deficient number, since it is larger than the sum of its proper divisors (6652437039).

13247539281 is a wasteful number, since it uses less digits than its factorization.

13247539281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11262 (or 11256 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 13247539281 in words is "thirteen billion, two hundred forty-seven million, five hundred thirty-nine thousand, two hundred eighty-one".