13188561 has 8 divisors (see below), whose sum is σ = 17609280. Its totient is φ = 8780112.

The previous prime is 13188557. The next prime is 13188587. The reversal of 13188561 is 16588131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13188561 - 2² = 13188557 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13188521) 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 7 ways as a sum of consecutive naturals, for example, 165 + ... + 5138.

It is an arithmetic number, because the mean of its divisors is an integer number (2201160).

Almost surely, 2^13188561 is an apocalyptic number.

It is an amenable number.

13188561 is a deficient number, since it is larger than the sum of its proper divisors (4420719).

13188561 is an equidigital number, since it uses as much as digits as its factorization.

13188561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6135.

The product of its digits is 5760, while the sum is 33.

The square root of 13188561 is about 3631.6058431498. The cubic root of 13188561 is about 236.2648623107.

The spelling of 13188561 in words is "thirteen million, one hundred eighty-eight thousand, five hundred sixty-one".