218841241 has 4 divisors (see below), whose sum is σ = 221923584. Its totient is φ = 215758900.

The previous prime is 218841191. The next prime is 218841247. The reversal of 218841241 is 142148812.

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 218841241 - 2²¹ = 216744089 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218841247) 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 3 ways as a sum of consecutive naturals, for example, 1541065 + ... + 1541206.

It is an arithmetic number, because the mean of its divisors is an integer number (55480896).

Almost surely, 2^218841241 is an apocalyptic number.

It is an amenable number.

218841241 is a deficient number, since it is larger than the sum of its proper divisors (3082343).

218841241 is an equidigital number, since it uses as much as digits as its factorization.

218841241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082342.

The product of its digits is 4096, while the sum is 31.

The square root of 218841241 is about 14793.2836449519. The cubic root of 218841241 is about 602.6193272717.

The spelling of 218841241 in words is "two hundred eighteen million, eight hundred forty-one thousand, two hundred forty-one".