231218166 has 8 divisors (see below), whose sum is σ = 462436344. Its totient is φ = 77072720.

The previous prime is 231218161. The next prime is 231218167. The reversal of 231218166 is 661812132.

It is a sphenic number, since it is the product of 3 distinct primes.

231218166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231218161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19268175 + ... + 19268186.

It is an arithmetic number, because the mean of its divisors is an integer number (57804543).

Almost surely, 2^231218166 is an apocalyptic number.

231218166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231218166 is a wasteful number, since it uses less digits than its factorization.

231218166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38536366.

The product of its digits is 3456, while the sum is 30.

The square root of 231218166 is about 15205.8595942485. The cubic root of 231218166 is about 613.7723464334.

The spelling of 231218166 in words is "two hundred thirty-one million, two hundred eighteen thousand, one hundred sixty-six".