231218085 has 16 divisors (see below), whose sum is σ = 422798976. Its totient is φ = 105699648.

The previous prime is 231217993. The next prime is 231218093. The reversal of 231218085 is 580812132.

231218085 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 231218085 - 2¹² = 231213989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1100934 + ... + 1101143.

It is an arithmetic number, because the mean of its divisors is an integer number (26424936).

Almost surely, 2^231218085 is an apocalyptic number.

It is an amenable number.

231218085 is a deficient number, since it is larger than the sum of its proper divisors (191580891).

231218085 is a wasteful number, since it uses less digits than its factorization.

231218085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202092.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 231218085 is about 15205.8569308014. The cubic root of 231218085 is about 613.7722747615.

The spelling of 231218085 in words is "two hundred thirty-one million, two hundred eighteen thousand, eighty-five".