13531321131 has 4 divisors (see below), whose sum is σ = 18041761512. Its totient is φ = 9020880752.

The previous prime is 13531321127. The next prime is 13531321147. The reversal of 13531321131 is 13112313531.

It is a happy number.

13531321131 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 an emirpimes, since its reverse is a distinct semiprime: 13112313531 = 3 ⋅4370771177.

It is a cyclic number.

It is not a de Polignac number, because 13531321131 - 2² = 13531321127 is a prime.

It is a super-2 number, since 2×13531321131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13531321031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255220186 + ... + 2255220191.

It is an arithmetic number, because the mean of its divisors is an integer number (4510440378).

Almost surely, 2^13531321131 is an apocalyptic number.

13531321131 is a deficient number, since it is larger than the sum of its proper divisors (4510440381).

13531321131 is an equidigital number, since it uses as much as digits as its factorization.

13531321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510440380.

The product of its digits is 810, while the sum is 24.

Adding to 13531321131 its reverse (13112313531), we get a palindrome (26643634662).

The spelling of 13531321131 in words is "thirteen billion, five hundred thirty-one million, three hundred twenty-one thousand, one hundred thirty-one".