118449181 has 4 divisors (see below), whose sum is σ = 118591200. Its totient is φ = 118307164.

The previous prime is 118449179. The next prime is 118449187. The reversal of 118449181 is 181944811.

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.

It is a cyclic number.

It is not a de Polignac number, because 118449181 - 2¹ = 118449179 is a prime.

It is a super-2 number, since 2×118449181² = 28060416959141522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118449181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118449187) 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, 69751 + ... + 71428.

It is an arithmetic number, because the mean of its divisors is an integer number (29647800).

Almost surely, 2^118449181 is an apocalyptic number.

It is an amenable number.

118449181 is a deficient number, since it is larger than the sum of its proper divisors (142019).

118449181 is an equidigital number, since it uses as much as digits as its factorization.

118449181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142018.

The product of its digits is 9216, while the sum is 37.

The square root of 118449181 is about 10883.4360842521. The cubic root of 118449181 is about 491.1083905315.

It can be divided in two parts, 11844 and 9181, that added together give a square (21025 = 145²).

The spelling of 118449181 in words is "one hundred eighteen million, four hundred forty-nine thousand, one hundred eighty-one".