13431352531 has 4 divisors (see below), whose sum is σ = 13506388200. Its totient is φ = 13356316864.

The previous prime is 13431352511. The next prime is 13431352553. The reversal of 13431352531 is 13525313431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13525313431 = 7 ⋅1932187633.

It is a cyclic number.

It is not a de Polignac number, because 13431352531 - 2¹⁷ = 13431221459 is a prime.

It is a super-2 number, since 2×13431352531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13431352493 and 13431352502.

It is not an unprimeable number, because it can be changed into a prime (13431352511) 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, 37517566 + ... + 37517923.

It is an arithmetic number, because the mean of its divisors is an integer number (3376597050).

Almost surely, 2^13431352531 is an apocalyptic number.

13431352531 is a deficient number, since it is larger than the sum of its proper divisors (75035669).

13431352531 is an equidigital number, since it uses as much as digits as its factorization.

13431352531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75035668.

The product of its digits is 16200, while the sum is 31.

Adding to 13431352531 its reverse (13525313431), we get a palindrome (26956665962).

The spelling of 13431352531 in words is "thirteen billion, four hundred thirty-one million, three hundred fifty-two thousand, five hundred thirty-one".