218043481 has 16 divisors (see below), whose sum is σ = 228294144. Its totient is φ = 208099584.

The previous prime is 218043467. The next prime is 218043493. The reversal of 218043481 is 184340812.

It is a cyclic number.

It is not a de Polignac number, because 218043481 - 2¹⁵ = 218010713 is a prime.

It is a super-2 number, since 2×218043481² = 95085919213194722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218043461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353085 + ... + 353701.

It is an arithmetic number, because the mean of its divisors is an integer number (14268384).

Almost surely, 2^218043481 is an apocalyptic number.

It is an amenable number.

218043481 is a deficient number, since it is larger than the sum of its proper divisors (10250663).

218043481 is a wasteful number, since it uses less digits than its factorization.

218043481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 218043481 is about 14766.2954392766. The cubic root of 218043481 is about 601.8861763881.

The spelling of 218043481 in words is "two hundred eighteen million, forty-three thousand, four hundred eighty-one".