218097217 has 16 divisors (see below), whose sum is σ = 240327360. Its totient is φ = 196689600.

The previous prime is 218097193. The next prime is 218097251. The reversal of 218097217 is 712790812.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218097217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218097917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138042 + ... + 139612.

It is an arithmetic number, because the mean of its divisors is an integer number (15020460).

Almost surely, 2^218097217 is an apocalyptic number.

It is an amenable number.

218097217 is a deficient number, since it is larger than the sum of its proper divisors (22230143).

218097217 is a wasteful number, since it uses less digits than its factorization.

218097217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 218097217 is about 14768.1148763138. The cubic root of 218097217 is about 601.9356165256.

The spelling of 218097217 in words is "two hundred eighteen million, ninety-seven thousand, two hundred seventeen".