118538681 has 4 divisors (see below), whose sum is σ = 118576500. Its totient is φ = 118500864.

The previous prime is 118538647. The next prime is 118538731. The reversal of 118538681 is 186835811.

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 55875625 + 62663056 = 7475^2 + 7916^2 .

It is a cyclic number.

It is not a de Polignac number, because 118538681 - 2⁶ = 118538617 is a prime.

It is a super-2 number, since 2×118538681² = 28102837786439522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (118538621) 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, 13736 + ... + 20633.

It is an arithmetic number, because the mean of its divisors is an integer number (29644125).

Almost surely, 2^118538681 is an apocalyptic number.

It is an amenable number.

118538681 is a deficient number, since it is larger than the sum of its proper divisors (37819).

118538681 is an equidigital number, since it uses as much as digits as its factorization.

118538681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37818.

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

The square root of 118538681 is about 10887.5470607479. The cubic root of 118538681 is about 491.2320529456.

The spelling of 118538681 in words is "one hundred eighteen million, five hundred thirty-eight thousand, six hundred eighty-one".