218104081 has 8 divisors (see below), whose sum is σ = 235001984. Its totient is φ = 201223440.

The previous prime is 218104057. The next prime is 218104087. The reversal of 218104081 is 180401812.

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

It is a cyclic number.

It is not a de Polignac number, because 218104081 - 2⁵ = 218104049 is a prime.

It is a super-2 number, since 2×218104081² = 95138780297709122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218104087) 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, 35800 + ... + 41446.

It is an arithmetic number, because the mean of its divisors is an integer number (29375248).

Almost surely, 2^218104081 is an apocalyptic number.

It is an amenable number.

218104081 is a deficient number, since it is larger than the sum of its proper divisors (16897903).

218104081 is a wasteful number, since it uses less digits than its factorization.

218104081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8631.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 218104081 is about 14768.3472670438. The cubic root of 218104081 is about 601.9419312060.

Adding to 218104081 its reverse (180401812), we get a palindrome (398505893).

The spelling of 218104081 in words is "two hundred eighteen million, one hundred four thousand, eighty-one".