11388561 has 16 divisors (see below), whose sum is σ = 15916800. Its totient is φ = 7233408.

The previous prime is 11388547. The next prime is 11388569. The reversal of 11388561 is 16588311.

11388561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11388561 - 2¹¹ = 11386513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11388569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6045 + ... + 7701.

It is an arithmetic number, because the mean of its divisors is an integer number (994800).

Almost surely, 2^11388561 is an apocalyptic number.

It is an amenable number.

11388561 is a deficient number, since it is larger than the sum of its proper divisors (4528239).

11388561 is a wasteful number, since it uses less digits than its factorization.

11388561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768.

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

The square root of 11388561 is about 3374.6942083691. The cubic root of 11388561 is about 224.9864090556.

The spelling of 11388561 in words is "eleven million, three hundred eighty-eight thousand, five hundred sixty-one".