218336819 has 4 divisors (see below), whose sum is σ = 218376096. Its totient is φ = 218297544.

The previous prime is 218336801. The next prime is 218336821. The reversal of 218336819 is 918633812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218336819 - 2²⁰ = 217288243 is a prime.

It is a super-2 number, since 2×218336819² = 95341933062077522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218336869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9584 + ... + 22989.

It is an arithmetic number, because the mean of its divisors is an integer number (54594024).

Almost surely, 2^218336819 is an apocalyptic number.

218336819 is a deficient number, since it is larger than the sum of its proper divisors (39277).

218336819 is an equidigital number, since it uses as much as digits as its factorization.

218336819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39276.

The product of its digits is 62208, while the sum is 41.

The square root of 218336819 is about 14776.2247884905. The cubic root of 218336819 is about 602.1559650419.

The spelling of 218336819 in words is "two hundred eighteen million, three hundred thirty-six thousand, eight hundred nineteen".