13133521 has 4 divisors (see below), whose sum is σ = 13217332. Its totient is φ = 13049712.

The previous prime is 13133507. The next prime is 13133531. The reversal of 13133521 is 12533131.

It is the 1480-th star number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1134225 + 11999296 = 1065^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 13133521 - 2²³ = 4744913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13133531) 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 3 ways as a sum of consecutive naturals, for example, 41670 + ... + 41983.

It is an arithmetic number, because the mean of its divisors is an integer number (3304333).

Almost surely, 2^13133521 is an apocalyptic number.

It is an amenable number.

13133521 is a deficient number, since it is larger than the sum of its proper divisors (83811).

13133521 is an equidigital number, since it uses as much as digits as its factorization.

13133521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83810.

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

The square root of 13133521 is about 3624.0200054635. The cubic root of 13133521 is about 235.9357349195.

Adding to 13133521 its reverse (12533131), we get a palindrome (25666652).

The spelling of 13133521 in words is "thirteen million, one hundred thirty-three thousand, five hundred twenty-one".