118561 has 4 divisors (see below), whose sum is σ = 120852. Its totient is φ = 116272.

The previous prime is 118549. The next prime is 118571. The reversal of 118561 is 165811.

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 90000 + 28561 = 300^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 118561 - 2⁵ = 118529 is a prime.

It is a Smith number, since the sum of its digits (22) 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 not an unprimeable number, because it can be changed into a prime (118571) 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, 1066 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (30213).

2¹¹⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

118561 is a deficient number, since it is larger than the sum of its proper divisors (2291).

118561 is an equidigital number, since it uses as much as digits as its factorization.

118561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290.

The product of its digits is 240, while the sum is 22.

The square root of 118561 is about 344.3268795781. The cubic root of 118561 is about 49.1262881476.

The spelling of 118561 in words is "one hundred eighteen thousand, five hundred sixty-one".