13321531 has 4 divisors (see below), whose sum is σ = 13900752. Its totient is φ = 12742312.

The previous prime is 13321513. The next prime is 13321559. The reversal of 13321531 is 13512331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13321531 - 2⁷ = 13321403 is a prime.

It is a super-2 number, since 2×13321531² = 354926376367922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 13321499 and 13321508.

It is not an unprimeable number, because it can be changed into a prime (13321331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289576 + ... + 289621.

It is an arithmetic number, because the mean of its divisors is an integer number (3475188).

Almost surely, 2^13321531 is an apocalyptic number.

13321531 is a deficient number, since it is larger than the sum of its proper divisors (579221).

13321531 is an equidigital number, since it uses as much as digits as its factorization.

13321531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579220.

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

The square root of 13321531 is about 3649.8672578602. The cubic root of 13321531 is about 237.0562335778.

Adding to 13321531 its reverse (13512331), we get a palindrome (26833862).

The spelling of 13321531 in words is "thirteen million, three hundred twenty-one thousand, five hundred thirty-one".