11788561 has 4 divisors (see below), whose sum is σ = 11848000. Its totient is φ = 11729124.

The previous prime is 11788549. The next prime is 11788571. The reversal of 11788561 is 16588711.

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.

It is a cyclic number.

It is not a de Polignac number, because 11788561 - 2¹¹ = 11786513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11788561.

It is not an unprimeable number, because it can be changed into a prime (11788571) 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, 29421 + ... + 29818.

It is an arithmetic number, because the mean of its divisors is an integer number (2962000).

Almost surely, 2^11788561 is an apocalyptic number.

It is an amenable number.

11788561 is a deficient number, since it is larger than the sum of its proper divisors (59439).

11788561 is an equidigital number, since it uses as much as digits as its factorization.

11788561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59438.

The product of its digits is 13440, while the sum is 37.

The square root of 11788561 is about 3433.4473929274. The cubic root of 11788561 is about 227.5902214308.

The spelling of 11788561 in words is "eleven million, seven hundred eighty-eight thousand, five hundred sixty-one".