231118128 has 120 divisors (see below), whose sum is σ = 721047600. Its totient is φ = 68677632.

The previous prime is 231118123. The next prime is 231118133. The reversal of 231118128 is 821811132.

It is an interprime number because it is at equal distance from previous prime (231118123) and next prime (231118133).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (231118123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44028 + ... + 48996.

It is an arithmetic number, because the mean of its divisors is an integer number (6008730).

Almost surely, 2^231118128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231118128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360523800).

231118128 is an abundant number, since it is smaller than the sum of its proper divisors (489929472).

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

231118128 is a wasteful number, since it uses less digits than its factorization.

231118128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019 (or 5010 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 231118128 is about 15202.5697827703. The cubic root of 231118128 is about 613.6838161703.

The spelling of 231118128 in words is "two hundred thirty-one million, one hundred eighteen thousand, one hundred twenty-eight".