231218958 has 16 divisors (see below), whose sum is σ = 462626640. Its totient is φ = 77041536.

The previous prime is 231218917. The next prime is 231218963. The reversal of 231218958 is 859812132.

231218958 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 11878 + ... + 24566.

It is an arithmetic number, because the mean of its divisors is an integer number (28914165).

Almost surely, 2^231218958 is an apocalyptic number.

231218958 is an abundant number, since it is smaller than the sum of its proper divisors (231407682).

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

231218958 is a wasteful number, since it uses less digits than its factorization.

231218958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15731.

The product of its digits is 34560, while the sum is 39.

The square root of 231218958 is about 15205.8856368184. The cubic root of 231218958 is about 613.7730472249.

The spelling of 231218958 in words is "two hundred thirty-one million, two hundred eighteen thousand, nine hundred fifty-eight".