116861 has 4 divisors (see below), whose sum is σ = 117852. Its totient is φ = 115872.

The previous prime is 116849. The next prime is 116867. The reversal of 116861 is 168611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 168611 = 103 ⋅1637.

It can be written as a sum of positive squares in 2 ways, for example, as 32761 + 84100 = 181^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 116861 - 2⁶ = 116797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116867) 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, 290 + ... + 563.

It is an arithmetic number, because the mean of its divisors is an integer number (29463).

2¹¹⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

116861 is a deficient number, since it is larger than the sum of its proper divisors (991).

116861 is an equidigital number, since it uses as much as digits as its factorization.

116861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its digits is 288, while the sum is 23.

The square root of 116861 is about 341.8493820383. The cubic root of 116861 is about 48.8903559783.

The spelling of 116861 in words is "one hundred sixteen thousand, eight hundred sixty-one".