118612181 has 2 divisors, whose sum is σ = 118612182. Its totient is φ = 118612180.

The previous prime is 118612171. The next prime is 118612217. The reversal of 118612181 is 181216811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115756081 + 2856100 = 10759^2 + 1690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118612181 is a prime.

It is a super-2 number, since 2×118612181² = 28137698963153522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118612171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59306090 + 59306091.

It is an arithmetic number, because the mean of its divisors is an integer number (59306091).

Almost surely, 2^118612181 is an apocalyptic number.

It is an amenable number.

118612181 is a deficient number, since it is larger than the sum of its proper divisors (1).

118612181 is an equidigital number, since it uses as much as digits as its factorization.

118612181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 29.

The square root of 118612181 is about 10890.9219536273. The cubic root of 118612181 is about 491.3335615720. Note that the first 3 decimals are identical.

Adding to 118612181 its reverse (181216811), we get a palindrome (299828992).

The spelling of 118612181 in words is "one hundred eighteen million, six hundred twelve thousand, one hundred eighty-one".