218281185109 has 8 divisors (see below), whose sum is σ = 235086316640. Its totient is φ = 201478092336.

The previous prime is 218281185091. The next prime is 218281185127. The reversal of 218281185109 is 901581182812.

It is a happy number.

218281185109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (218281185091) and next prime (218281185127).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218281185109 - 2¹⁷ = 218281054037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218281185139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283599 + ... + 719020.

It is an arithmetic number, because the mean of its divisors is an integer number (29385789580).

Almost surely, 2^218281185109 is an apocalyptic number.

It is an amenable number.

218281185109 is a deficient number, since it is larger than the sum of its proper divisors (16805131531).

218281185109 is a wasteful number, since it uses less digits than its factorization.

218281185109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019379.

The product of its (nonzero) digits is 92160, while the sum is 46.

The spelling of 218281185109 in words is "two hundred eighteen billion, two hundred eighty-one million, one hundred eighty-five thousand, one hundred nine".