218225873 has 4 divisors (see below), whose sum is σ = 218557680. Its totient is φ = 217894068.

The previous prime is 218225851. The next prime is 218225879. The reversal of 218225873 is 378522812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218225873 - 2¹⁸ = 217963729 is a prime.

It is a super-2 number, since 2×218225873² = 95245063293224258, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218225879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164915 + ... + 166232.

It is an arithmetic number, because the mean of its divisors is an integer number (54639420).

Almost surely, 2^218225873 is an apocalyptic number.

It is an amenable number.

218225873 is a deficient number, since it is larger than the sum of its proper divisors (331807).

218225873 is an equidigital number, since it uses as much as digits as its factorization.

218225873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331806.

The product of its digits is 53760, while the sum is 38.

The square root of 218225873 is about 14772.4701048944. The cubic root of 218225873 is about 602.0539542816.

The spelling of 218225873 in words is "two hundred eighteen million, two hundred twenty-five thousand, eight hundred seventy-three".