231528 has 32 divisors (see below), whose sum is σ = 632160. Its totient is φ = 70080.

The previous prime is 231503. The next prime is 231529. The reversal of 231528 is 825132.

231528 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×231528³ = 37233324505529856, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (231529) by changing a digit.

231528 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175 + ... + 702.

It is an arithmetic number, because the mean of its divisors is an integer number (19755).

2²³¹⁵²⁸ is an apocalyptic number.

It is an amenable number.

231528 is an abundant number, since it is smaller than the sum of its proper divisors (400632).

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

231528 is a wasteful number, since it uses less digits than its factorization.

231528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 893 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 231528 is about 481.1735653587. The cubic root of 231528 is about 61.4046377184.

It can be divided in two parts, 23 and 1528, that added together give a palindrome (1551).

The spelling of 231528 in words is "two hundred thirty-one thousand, five hundred twenty-eight".