118918909 has 4 divisors (see below), whose sum is σ = 121162716. Its totient is φ = 116675104.

The previous prime is 118918907. The next prime is 118918913. The reversal of 118918909 is 909819811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909819811 = 647 ⋅1406213.

It can be written as a sum of positive squares in 2 ways, for example, as 103591684 + 15327225 = 10178^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 118918909 - 2¹ = 118918907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118918907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121824 + ... + 1121929.

It is an arithmetic number, because the mean of its divisors is an integer number (30290679).

Almost surely, 2^118918909 is an apocalyptic number.

It is an amenable number.

118918909 is a deficient number, since it is larger than the sum of its proper divisors (2243807).

118918909 is an equidigital number, since it uses as much as digits as its factorization.

118918909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243806.

The product of its (nonzero) digits is 46656, while the sum is 46.

The square root of 118918909 is about 10904.9946813375. The cubic root of 118918909 is about 491.7567222701.

The spelling of 118918909 in words is "one hundred eighteen million, nine hundred eighteen thousand, nine hundred nine".