201118909 has 4 divisors (see below), whose sum is σ = 201162016. Its totient is φ = 201075804.

The previous prime is 201118903. The next prime is 201118919. The reversal of 201118909 is 909811102.

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 201118909 - 2⁹ = 201118397 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 (201118903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13569 + ... + 24214.

It is an arithmetic number, because the mean of its divisors is an integer number (50290504).

Almost surely, 2^201118909 is an apocalyptic number.

It is an amenable number.

201118909 is a deficient number, since it is larger than the sum of its proper divisors (43107).

201118909 is an equidigital number, since it uses as much as digits as its factorization.

201118909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43106.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 201118909 is about 14181.6398558136. The cubic root of 201118909 is about 585.8920901138.

The spelling of 201118909 in words is "two hundred one million, one hundred eighteen thousand, nine hundred nine".