11518861 has 4 divisors (see below), whose sum is σ = 11736252. Its totient is φ = 11301472.

The previous prime is 11518853. The next prime is 11518867. The reversal of 11518861 is 16881511.

It is a happy number.

11518861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3572100 + 7946761 = 1890^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 11518861 - 2³ = 11518853 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11518867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108616 + ... + 108721.

It is an arithmetic number, because the mean of its divisors is an integer number (2934063).

Almost surely, 2^11518861 is an apocalyptic number.

It is an amenable number.

11518861 is a deficient number, since it is larger than the sum of its proper divisors (217391).

11518861 is an equidigital number, since it uses as much as digits as its factorization.

11518861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217390.

The product of its digits is 1920, while the sum is 31.

The square root of 11518861 is about 3393.9447550012. The cubic root of 11518861 is about 225.8412033525.

The spelling of 11518861 in words is "eleven million, five hundred eighteen thousand, eight hundred sixty-one".