218449117 has 4 divisors (see below), whose sum is σ = 218544156. Its totient is φ = 218354080.

The previous prime is 218449109. The next prime is 218449123. The reversal of 218449117 is 711944812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41718681 + 176730436 = 6459^2 + 13294^2 .

It is a cyclic number.

It is not a de Polignac number, because 218449117 - 2³ = 218449109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218449717) 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, 43984 + ... + 48697.

It is an arithmetic number, because the mean of its divisors is an integer number (54636039).

Almost surely, 2^218449117 is an apocalyptic number.

It is an amenable number.

218449117 is a deficient number, since it is larger than the sum of its proper divisors (95039).

218449117 is an equidigital number, since it uses as much as digits as its factorization.

218449117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95038.

The product of its digits is 16128, while the sum is 37.

The square root of 218449117 is about 14780.0242557311. The cubic root of 218449117 is about 602.2591837308.

The spelling of 218449117 in words is "two hundred eighteen million, four hundred forty-nine thousand, one hundred seventeen".