218478481 has 8 divisors (see below), whose sum is σ = 237138944. Its totient is φ = 200082960.

The previous prime is 218478479. The next prime is 218478497. The reversal of 218478481 is 184874812.

218478481 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 a cyclic number.

It is not a de Polignac number, because 218478481 - 2¹ = 218478479 is a prime.

It is a super-2 number, since 2×218478481² = 95465693320134722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218478581) 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, 64515 + ... + 67816.

It is an arithmetic number, because the mean of its divisors is an integer number (29642368).

Almost surely, 2^218478481 is an apocalyptic number.

It is an amenable number.

218478481 is a deficient number, since it is larger than the sum of its proper divisors (18660463).

218478481 is a wasteful number, since it uses less digits than its factorization.

218478481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132471.

The product of its digits is 114688, while the sum is 43.

The square root of 218478481 is about 14781.0175901390. The cubic root of 218478481 is about 602.2861678123.

The spelling of 218478481 in words is "two hundred eighteen million, four hundred seventy-eight thousand, four hundred eighty-one".