11538561 has 8 divisors (see below), whose sum is σ = 15800704. Its totient is φ = 7484400.

The previous prime is 11538557. The next prime is 11538601. The reversal of 11538561 is 16583511.

11538561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11538561 - 2² = 11538557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11538361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51865 + ... + 52086.

It is an arithmetic number, because the mean of its divisors is an integer number (1975088).

Almost surely, 2^11538561 is an apocalyptic number.

It is an amenable number.

11538561 is a deficient number, since it is larger than the sum of its proper divisors (4262143).

11538561 is a wasteful number, since it uses less digits than its factorization.

11538561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103991.

The product of its digits is 3600, while the sum is 30.

The square root of 11538561 is about 3396.8457427443. The cubic root of 11538561 is about 225.9698774691.

The spelling of 11538561 in words is "eleven million, five hundred thirty-eight thousand, five hundred sixty-one".