118243109 has 4 divisors (see below), whose sum is σ = 125198604. Its totient is φ = 111287616.

The previous prime is 118243079. The next prime is 118243123. The reversal of 118243109 is 901342811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901342811 = 41 ⋅21983971.

It can be written as a sum of positive squares in 2 ways, for example, as 50098084 + 68145025 = 7078^2 + 8255^2 .

It is a cyclic number.

It is not a de Polignac number, because 118243109 - 2¹⁶ = 118177573 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 (118273109) 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, 3477722 + ... + 3477755.

It is an arithmetic number, because the mean of its divisors is an integer number (31299651).

Almost surely, 2^118243109 is an apocalyptic number.

It is an amenable number.

118243109 is a deficient number, since it is larger than the sum of its proper divisors (6955495).

118243109 is an equidigital number, since it uses as much as digits as its factorization.

118243109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6955494.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 118243109 is about 10873.9647323320. The cubic root of 118243109 is about 490.8234232178.

The spelling of 118243109 in words is "one hundred eighteen million, two hundred forty-three thousand, one hundred nine".