218913 has 8 divisors (see below), whose sum is σ = 298848. Its totient is φ = 142464.

The previous prime is 218887. The next prime is 218923. The reversal of 218913 is 319812.

218913 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 not a de Polignac number, because 218913 - 2⁶ = 218849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218923) 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, 720 + ... + 977.

It is an arithmetic number, because the mean of its divisors is an integer number (37356).

2²¹⁸⁹¹³ is an apocalyptic number.

It is an amenable number.

218913 is a deficient number, since it is larger than the sum of its proper divisors (79935).

218913 is a wasteful number, since it uses less digits than its factorization.

218913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743.

The product of its digits is 432, while the sum is 24.

The square root of 218913 is about 467.8813952275. The cubic root of 218913 is about 60.2685187245.

It can be divided in two parts, 2 and 18913, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 218913 in words is "two hundred eighteen thousand, nine hundred thirteen".