218930331 has 16 divisors (see below), whose sum is σ = 308426240. Its totient is φ = 137751840.

The previous prime is 218930317. The next prime is 218930357. The reversal of 218930331 is 133039812.

218930331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218930331 - 2⁷ = 218930203 is a prime.

It is a super-2 number, since 2×218930331² = 95860979663539122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218930531) 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, 8361 + ... + 22533.

It is an arithmetic number, because the mean of its divisors is an integer number (19276640).

Almost surely, 2^218930331 is an apocalyptic number.

218930331 is a deficient number, since it is larger than the sum of its proper divisors (89495909).

218930331 is a wasteful number, since it uses less digits than its factorization.

218930331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14466.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 218930331 is about 14796.2945023408. The cubic root of 218930331 is about 602.7010913730.

The spelling of 218930331 in words is "two hundred eighteen million, nine hundred thirty thousand, three hundred thirty-one".