231128 has 16 divisors (see below), whose sum is σ = 438480. Its totient is φ = 114208.

The previous prime is 231109. The next prime is 231131. The reversal of 231128 is 821132.

231128 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.

231128 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250 + ... + 1422.

It is an arithmetic number, because the mean of its divisors is an integer number (27405).

2²³¹¹²⁸ is an apocalyptic number.

It is an amenable number.

231128 is a deficient number, since it is larger than the sum of its proper divisors (207352).

231128 is a wasteful number, since it uses less digits than its factorization.

231128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 342 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 231128 is about 480.7577352472. The cubic root of 231128 is about 61.3692553694.

The spelling of 231128 in words is "two hundred thirty-one thousand, one hundred twenty-eight".