201818201 has 8 divisors (see below), whose sum is σ = 217453824. Its totient is φ = 186198480.

The previous prime is 201818189. The next prime is 201818213. The reversal of 201818201 is 102818102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (201818189) and next prime (201818213).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201818201 - 2²² = 197623897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201818251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43160 + ... + 47606.

It is an arithmetic number, because the mean of its divisors is an integer number (27181728).

Almost surely, 2^201818201 is an apocalyptic number.

It is an amenable number.

201818201 is a deficient number, since it is larger than the sum of its proper divisors (15635623).

201818201 is a wasteful number, since it uses less digits than its factorization.

201818201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7951.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 201818201 is about 14206.2732973852. The cubic root of 201818201 is about 586.5703550502.

Subtracting from 201818201 its reverse (102818102), we obtain a palindrome (99000099).

It can be divided in two parts, 20181 and 8201, that added together give a palindrome (28382).

The spelling of 201818201 in words is "two hundred one million, eight hundred eighteen thousand, two hundred one".