218816197 has 16 divisors (see below), whose sum is σ = 241588224. Its totient is φ = 197280000.

The previous prime is 218816173. The next prime is 218816203. The reversal of 218816197 is 791618812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 218816197 - 2⁷ = 218816069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218816797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51172 + ... + 55282.

It is an arithmetic number, because the mean of its divisors is an integer number (15099264).

Almost surely, 2^218816197 is an apocalyptic number.

It is an amenable number.

218816197 is a deficient number, since it is larger than the sum of its proper divisors (22772027).

218816197 is a wasteful number, since it uses less digits than its factorization.

218816197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260.

The product of its digits is 48384, while the sum is 43.

The square root of 218816197 is about 14792.4371555197. The cubic root of 218816197 is about 602.5963386521.

The spelling of 218816197 in words is "two hundred eighteen million, eight hundred sixteen thousand, one hundred ninety-seven".