218118481 has 8 divisors (see below), whose sum is σ = 250672320. Its totient is φ = 185913168.

The previous prime is 218118469. The next prime is 218118487. The reversal of 218118481 is 184811812.

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

It is not a de Polignac number, because 218118481 - 2⁷ = 218118353 is a prime.

It is a super-2 number, since 2×218118481² = 95151343507494722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218118487) 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, 85786 + ... + 88291.

It is an arithmetic number, because the mean of its divisors is an integer number (31334040).

Almost surely, 2^218118481 is an apocalyptic number.

It is an amenable number.

218118481 is a deficient number, since it is larger than the sum of its proper divisors (32553839).

218118481 is a wasteful number, since it uses less digits than its factorization.

218118481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174263.

The product of its digits is 4096, while the sum is 34.

The square root of 218118481 is about 14768.8347881612. The cubic root of 218118481 is about 601.9551783570.

The spelling of 218118481 in words is "two hundred eighteen million, one hundred eighteen thousand, four hundred eighty-one".