218244009 has 16 divisors (see below), whose sum is σ = 296856000. Its totient is φ = 142579776.

The previous prime is 218244007. The next prime is 218244017. The reversal of 218244009 is 900442812.

It is not a de Polignac number, because 218244009 - 2¹ = 218244007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218244007) 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, 60007 + ... + 63539.

It is an arithmetic number, because the mean of its divisors is an integer number (18553500).

Almost surely, 2^218244009 is an apocalyptic number.

It is an amenable number.

218244009 is a deficient number, since it is larger than the sum of its proper divisors (78611991).

218244009 is a wasteful number, since it uses less digits than its factorization.

218244009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944.

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

The square root of 218244009 is about 14773.0839366735. The cubic root of 218244009 is about 602.0706320292.

The spelling of 218244009 in words is "two hundred eighteen million, two hundred forty-four thousand, nine".