11561538 has 32 divisors (see below), whose sum is σ = 25007040. Its totient is φ = 3551040.

The previous prime is 11561531. The next prime is 11561591. The reversal of 11561538 is 83516511.

It is not an unprimeable number, because it can be changed into a prime (11561531) 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, 2848 + ... + 5588.

It is an arithmetic number, because the mean of its divisors is an integer number (781470).

Almost surely, 2^11561538 is an apocalyptic number.

11561538 is an abundant number, since it is smaller than the sum of its proper divisors (13445502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11561538 is a wasteful number, since it uses less digits than its factorization.

11561538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802.

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

The square root of 11561538 is about 3400.2261689482. The cubic root of 11561538 is about 226.1197710099.

The spelling of 11561538 in words is "eleven million, five hundred sixty-one thousand, five hundred thirty-eight".