118444181 has 4 divisors (see below), whose sum is σ = 123593952. Its totient is φ = 113294412.

The previous prime is 118444171. The next prime is 118444199. The reversal of 118444181 is 181444811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181444811 = 53 ⋅3423487.

It is a de Polignac number, because none of the positive numbers 2^k-118444181 is a prime.

It is a super-2 number, since 2×118444181² = 28058048025521522, 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 (118444111) 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 in 3 ways as a sum of consecutive naturals, for example, 2574851 + ... + 2574896.

It is an arithmetic number, because the mean of its divisors is an integer number (30898488).

Almost surely, 2^118444181 is an apocalyptic number.

It is an amenable number.

118444181 is a deficient number, since it is larger than the sum of its proper divisors (5149771).

118444181 is an equidigital number, since it uses as much as digits as its factorization.

118444181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5149770.

The product of its digits is 4096, while the sum is 32.

The square root of 118444181 is about 10883.2063749614. The cubic root of 118444181 is about 491.1014801798.

Adding to 118444181 its reverse (181444811), we get a palindrome (299888992).

The spelling of 118444181 in words is "one hundred eighteen million, four hundred forty-four thousand, one hundred eighty-one".