218880217 has 4 divisors (see below), whose sum is σ = 219917776. Its totient is φ = 217842660.

The previous prime is 218880131. The next prime is 218880227. The reversal of 218880217 is 712088812.

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 218880217 - 2¹⁵ = 218847449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218880227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518463 + ... + 518884.

It is an arithmetic number, because the mean of its divisors is an integer number (54979444).

Almost surely, 2^218880217 is an apocalyptic number.

It is an amenable number.

218880217 is a deficient number, since it is larger than the sum of its proper divisors (1037559).

218880217 is a wasteful number, since it uses less digits than its factorization.

218880217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037558.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 218880217 is about 14794.6009408838. The cubic root of 218880217 is about 602.6551009930.

The spelling of 218880217 in words is "two hundred eighteen million, eight hundred eighty thousand, two hundred seventeen".