13521331 has 4 divisors (see below), whose sum is σ = 14233000. Its totient is φ = 12809664.

The previous prime is 13521329. The next prime is 13521359. The reversal of 13521331 is 13312531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13312531 = 89 ⋅149579.

It is a cyclic number.

It is not a de Polignac number, because 13521331 - 2¹ = 13521329 is a prime.

It is a super-2 number, since 2×13521331² = 365652784023122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 711649 = 13521331 / (1 + 3 + 5 + 2 + 1 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13521299 and 13521308.

It is not an unprimeable number, because it can be changed into a prime (13521031) 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, 355806 + ... + 355843.

It is an arithmetic number, because the mean of its divisors is an integer number (3558250).

Almost surely, 2^13521331 is an apocalyptic number.

13521331 is a deficient number, since it is larger than the sum of its proper divisors (711669).

13521331 is an equidigital number, since it uses as much as digits as its factorization.

13521331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711668.

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

The square root of 13521331 is about 3677.1362498553. The cubic root of 13521331 is about 238.2355023629.

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

The spelling of 13521331 in words is "thirteen million, five hundred twenty-one thousand, three hundred thirty-one".