13531648724681 has 4 divisors (see below), whose sum is σ = 14119981277952. Its totient is φ = 12943316171412.

The previous prime is 13531648724669. The next prime is 13531648724719. The reversal of 13531648724681 is 18642784613531.

It is a happy number.

13531648724681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13531648724681 - 2¹⁸ = 13531648462537 is a prime.

It is a super-2 number, since 2×13531648724681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13531648724681.

It is not an unprimeable number, because it can be changed into a prime (13531648724611) 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, 294166276601 + ... + 294166276646.

It is an arithmetic number, because the mean of its divisors is an integer number (3529995319488).

Almost surely, 2^{13531648724681} is an apocalyptic number.

It is an amenable number.

13531648724681 is a deficient number, since it is larger than the sum of its proper divisors (588332553271).

13531648724681 is an equidigital number, since it uses as much as digits as its factorization.

13531648724681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588332553270.

The product of its digits is 23224320, while the sum is 59.

The spelling of 13531648724681 in words is "thirteen trillion, five hundred thirty-one billion, six hundred forty-eight million, seven hundred twenty-four thousand, six hundred eighty-one".