13312531 has 4 divisors (see below), whose sum is σ = 13462200. Its totient is φ = 13162864.

The previous prime is 13312529. The next prime is 13312553. The reversal of 13312531 is 13521331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13521331 = 19 ⋅711649.

It is a cyclic number.

It is not a de Polignac number, because 13312531 - 2¹ = 13312529 is a prime.

It is a super-2 number, since 2×13312531² = 354446963251922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13312499 and 13312508.

It is not an unprimeable number, because it can be changed into a prime (13312591) 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, 74701 + ... + 74878.

It is an arithmetic number, because the mean of its divisors is an integer number (3365550).

Almost surely, 2^13312531 is an apocalyptic number.

13312531 is a deficient number, since it is larger than the sum of its proper divisors (149669).

13312531 is an equidigital number, since it uses as much as digits as its factorization.

13312531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149668.

The product of its digits is 270, while the sum is 19.

The square root of 13312531 is about 3648.6341279991. The cubic root of 13312531 is about 237.0028366435.

Adding to 13312531 its reverse (13521331), we get a palindrome (26833862).

The spelling of 13312531 in words is "thirteen million, three hundred twelve thousand, five hundred thirty-one".