218342273 has 4 divisors (see below), whose sum is σ = 218371908. Its totient is φ = 218312640.

The previous prime is 218342239. The next prime is 218342287. The reversal of 218342273 is 372243812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 112190464 + 106151809 = 10592^2 + 10303^2 .

It is a cyclic number.

It is not a de Polignac number, because 218342273 - 2¹⁴ = 218325889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218345273) 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 in 3 ways as a sum of consecutive naturals, for example, 5765 + ... + 21677.

It is an arithmetic number, because the mean of its divisors is an integer number (54592977).

Almost surely, 2^218342273 is an apocalyptic number.

It is an amenable number.

218342273 is a deficient number, since it is larger than the sum of its proper divisors (29635).

218342273 is a wasteful number, since it uses less digits than its factorization.

218342273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29634.

The product of its digits is 16128, while the sum is 32.

The square root of 218342273 is about 14776.4093405671. The cubic root of 218342273 is about 602.1609789027.

The spelling of 218342273 in words is "two hundred eighteen million, three hundred forty-two thousand, two hundred seventy-three".