218197 has 12 divisors (see below), whose sum is σ = 261516. Its totient is φ = 181440.

The previous prime is 218191. The next prime is 218213. The reversal of 218197 is 791812.

218197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 53361 + 164836 = 231^2 + 406^2 .

It is not a de Polignac number, because 218197 - 2⁷ = 218069 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2953 + ... + 3025.

It is an arithmetic number, because the mean of its divisors is an integer number (21793).

2²¹⁸¹⁹⁷ is an apocalyptic number.

It is an amenable number.

218197 is a deficient number, since it is larger than the sum of its proper divisors (43319).

218197 is an equidigital number, since it uses as much as digits as its factorization.

218197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 141 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The square root of 218197 is about 467.1156173797. The cubic root of 218197 is about 60.2027400952.

It can be divided in two parts, 2181 and 97, that added together give a triangular number (2278 = T₆₇).

The spelling of 218197 in words is "two hundred eighteen thousand, one hundred ninety-seven".