13531321431 has 10 divisors (see below), whose sum is σ = 20213455592. Its totient is φ = 9020880900.

The previous prime is 13531321387. The next prime is 13531321483. The reversal of 13531321431 is 13412313531.

13531321431 is a `hidden beast` number, since 135 + 313 + 214 + 3 + 1 = 666.

13531321431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13531321431 - 2⁹ = 13531320919 is a prime.

It is a super-2 number, since 2×13531321431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13531321395 and 13531321404.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 83526595 + ... + 83526756.

Almost surely, 2^13531321431 is an apocalyptic number.

13531321431 is a deficient number, since it is larger than the sum of its proper divisors (6682134161).

13531321431 is an equidigital number, since it uses as much as digits as its factorization.

13531321431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167053363 (or 167053354 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

Adding to 13531321431 its reverse (13412313531), we get a palindrome (26943634962).

The spelling of 13531321431 in words is "thirteen billion, five hundred thirty-one million, three hundred twenty-one thousand, four hundred thirty-one".