218315 has 8 divisors (see below), whose sum is σ = 267840. Its totient is φ = 170752.

The previous prime is 218287. The next prime is 218357. The reversal of 218315 is 513812.

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 218315 - 2¹² = 214219 is a prime.

It is a super-2 number, since 2×218315² = 95322878450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230 + ... + 699.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2²¹⁸³¹⁵ is an apocalyptic number.

218315 is a deficient number, since it is larger than the sum of its proper divisors (49525).

218315 is an equidigital number, since it uses as much as digits as its factorization.

218315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981.

The product of its digits is 240, while the sum is 20.

The square root of 218315 is about 467.2419073671. The cubic root of 218315 is about 60.2135906005.

The spelling of 218315 in words is "two hundred eighteen thousand, three hundred fifteen".