13320531 has 48 divisors (see below), whose sum is σ = 23482368. Its totient is φ = 7387200.

The previous prime is 13320521. The next prime is 13320533. The reversal of 13320531 is 13502331.

13320531 is a `hidden beast` number, since 133 + 2 + 0 + 531 = 666.

It is not a de Polignac number, because 13320531 - 2⁶ = 13320467 is a prime.

It is a super-2 number, since 2×13320531² = 354873092243922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13320533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69646 + ... + 69836.

It is an arithmetic number, because the mean of its divisors is an integer number (489216).

Almost surely, 2^13320531 is an apocalyptic number.

13320531 is a deficient number, since it is larger than the sum of its proper divisors (10161837).

13320531 is an equidigital number, since it uses as much as digits as its factorization.

13320531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 13320531 is about 3649.7302640058. The cubic root of 13320531 is about 237.0503017729.

Adding to 13320531 its reverse (13502331), we get a palindrome (26822862).

The spelling of 13320531 in words is "thirteen million, three hundred twenty thousand, five hundred thirty-one".