118683581 has 4 divisors (see below), whose sum is σ = 118705500. Its totient is φ = 118661664.

The previous prime is 118683571. The next prime is 118683629. The reversal of 118683581 is 185386811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 185386811 = 331 ⋅560081.

It can be written as a sum of positive squares in 2 ways, for example, as 87703225 + 30980356 = 9365^2 + 5566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118683581 is a prime.

It is a super-2 number, since 2×118683581² = 28171584797967122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118683571) 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, 3695 + ... + 15843.

It is an arithmetic number, because the mean of its divisors is an integer number (29676375).

Almost surely, 2^118683581 is an apocalyptic number.

It is an amenable number.

118683581 is a deficient number, since it is larger than the sum of its proper divisors (21919).

118683581 is an equidigital number, since it uses as much as digits as its factorization.

118683581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21918.

The product of its digits is 46080, while the sum is 41.

The square root of 118683581 is about 10894.1994198748. The cubic root of 118683581 is about 491.4321298055.

The spelling of 118683581 in words is "one hundred eighteen million, six hundred eighty-three thousand, five hundred eighty-one".