218364681 has 8 divisors (see below), whose sum is σ = 295141600. Its totient is φ = 143582112.

The previous prime is 218364673. The next prime is 218364697. The reversal of 218364681 is 186463812.

218364681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218364681 - 2³ = 218364673 is a prime.

It is a super-2 number, since 2×218364681² = 95366267816463522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218364631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498331 + ... + 498768.

It is an arithmetic number, because the mean of its divisors is an integer number (36892700).

Almost surely, 2^218364681 is an apocalyptic number.

It is an amenable number.

218364681 is a deficient number, since it is larger than the sum of its proper divisors (76776919).

218364681 is an equidigital number, since it uses as much as digits as its factorization.

218364681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997175.

The product of its digits is 55296, while the sum is 39.

The square root of 218364681 is about 14777.1675567410. The cubic root of 218364681 is about 602.1815776954.

The spelling of 218364681 in words is "two hundred eighteen million, three hundred sixty-four thousand, six hundred eighty-one".