218555201 has 4 divisors (see below), whose sum is σ = 218726832. Its totient is φ = 218383572.

The previous prime is 218555173. The next prime is 218555203. The reversal of 218555201 is 102555812.

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 218555201 - 2¹⁸ = 218293057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218555203) 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, 83891 + ... + 86456.

It is an arithmetic number, because the mean of its divisors is an integer number (54681708).

Almost surely, 2^218555201 is an apocalyptic number.

It is an amenable number.

218555201 is a deficient number, since it is larger than the sum of its proper divisors (171631).

218555201 is a wasteful number, since it uses less digits than its factorization.

218555201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171630.

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 218555201 is about 14783.6125828567. The cubic root of 218555201 is about 602.3566583354.

The spelling of 218555201 in words is "two hundred eighteen million, five hundred fifty-five thousand, two hundred one".