218671 has 8 divisors (see below), whose sum is σ = 244080. Its totient is φ = 194688.

The previous prime is 218657. The next prime is 218677. The reversal of 218671 is 176812.

218671 is nontrivially palindromic in base 14.

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 218671 - 2¹⁵ = 185903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16 + ... + 661.

It is an arithmetic number, because the mean of its divisors is an integer number (30510).

2²¹⁸⁶⁷¹ is an apocalyptic number.

218671 is a deficient number, since it is larger than the sum of its proper divisors (25409).

218671 is a wasteful number, since it uses less digits than its factorization.

218671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713.

The product of its digits is 672, while the sum is 25.

The square root of 218671 is about 467.6227111679. The cubic root of 218671 is about 60.2463023505.

The spelling of 218671 in words is "two hundred eighteen thousand, six hundred seventy-one".