218441361 has 4 divisors (see below), whose sum is σ = 291255152. Its totient is φ = 145627572.

The previous prime is 218441351. The next prime is 218441387. The reversal of 218441361 is 163144812.

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 de Polignac number, because none of the positive numbers 2^k-218441361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218441351) 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, 36406891 + ... + 36406896.

It is an arithmetic number, because the mean of its divisors is an integer number (72813788).

Almost surely, 2^218441361 is an apocalyptic number.

It is an amenable number.

218441361 is a deficient number, since it is larger than the sum of its proper divisors (72813791).

218441361 is an equidigital number, since it uses as much as digits as its factorization.

218441361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72813790.

The product of its digits is 4608, while the sum is 30.

The square root of 218441361 is about 14779.7618722360. The cubic root of 218441361 is about 602.2520559420.

The spelling of 218441361 in words is "two hundred eighteen million, four hundred forty-one thousand, three hundred sixty-one".