218369197 has 2 divisors, whose sum is σ = 218369198. Its totient is φ = 218369196.

The previous prime is 218369189. The next prime is 218369201. The reversal of 218369197 is 791963812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166255236 + 52113961 = 12894^2 + 7219^2 .

It is a cyclic number.

It is not a de Polignac number, because 218369197 - 2³ = 218369189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218369297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109184598 + 109184599.

It is an arithmetic number, because the mean of its divisors is an integer number (109184599).

Almost surely, 2^218369197 is an apocalyptic number.

It is an amenable number.

218369197 is a deficient number, since it is larger than the sum of its proper divisors (1).

218369197 is an equidigital number, since it uses as much as digits as its factorization.

218369197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 46.

The square root of 218369197 is about 14777.3203592532. The cubic root of 218369197 is about 602.1857289059.

The spelling of 218369197 in words is "two hundred eighteen million, three hundred sixty-nine thousand, one hundred ninety-seven".