201540218 has 32 divisors (see below), whose sum is σ = 339621120. Its totient is φ = 88920000.

The previous prime is 201540211. The next prime is 201540223. The reversal of 201540218 is 812045102.

201540218 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201540193 and 201540202.

It is not an unprimeable number, because it can be changed into a prime (201540211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105068 + ... + 106968.

It is an arithmetic number, because the mean of its divisors is an integer number (10613160).

Almost surely, 2^201540218 is an apocalyptic number.

201540218 is a deficient number, since it is larger than the sum of its proper divisors (138080902).

201540218 is a wasteful number, since it uses less digits than its factorization.

201540218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 201540218 is about 14196.4861145285. The cubic root of 201540218 is about 586.3009186501.

The spelling of 201540218 in words is "two hundred one million, five hundred forty thousand, two hundred eighteen".