118681 has 2 divisors, whose sum is σ = 118682. Its totient is φ = 118680.

The previous prime is 118673. The next prime is 118687. The reversal of 118681 is 186811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80656 + 38025 = 284^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 118681 - 2³ = 118673 is a prime.

It is a super-2 number, since 2×118681² = 28170359522, which contains 22 as substring.

It is the 345-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (118687) by changing a digit.

It is a nontrivial repunit in base 344.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59340 + 59341.

It is an arithmetic number, because the mean of its divisors is an integer number (59341).

2¹¹⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

118681 is a deficient number, since it is larger than the sum of its proper divisors (1).

118681 is an equidigital number, since it uses as much as digits as its factorization.

118681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 25.

The square root of 118681 is about 344.5010885324. The cubic root of 118681 is about 49.1428567405.

The spelling of 118681 in words is "one hundred eighteen thousand, six hundred eighty-one".