13133561 has 4 divisors (see below), whose sum is σ = 15009792. Its totient is φ = 11257332.

The previous prime is 13133531. The next prime is 13133567. The reversal of 13133561 is 16533131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16533131 = 71 ⋅232861.

It is a cyclic number.

It is not a de Polignac number, because 13133561 - 2¹⁴ = 13117177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13133567) 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, 938105 + ... + 938118.

It is an arithmetic number, because the mean of its divisors is an integer number (3752448).

Almost surely, 2^13133561 is an apocalyptic number.

It is an amenable number.

13133561 is a deficient number, since it is larger than the sum of its proper divisors (1876231).

13133561 is an equidigital number, since it uses as much as digits as its factorization.

13133561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876230.

The product of its digits is 810, while the sum is 23.

The square root of 13133561 is about 3624.0255241927. The cubic root of 13133561 is about 235.9359744445.

Adding to 13133561 its reverse (16533131), we get a palindrome (29666692).

The spelling of 13133561 in words is "thirteen million, one hundred thirty-three thousand, five hundred sixty-one".