231500 has 24 divisors (see below), whose sum is σ = 506688. Its totient is φ = 92400.

The previous prime is 231493. The next prime is 231503. The reversal of 231500 is 5132.

231500 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (231503) by changing a digit.

231500 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, 269 + ... + 731.

It is an arithmetic number, because the mean of its divisors is an integer number (21112).

2²³¹⁵⁰⁰ is an apocalyptic number.

231500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253344).

231500 is an abundant number, since it is smaller than the sum of its proper divisors (275188).

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

231500 is a wasteful number, since it uses less digits than its factorization.

231500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 231500 is about 481.1444689488. The cubic root of 231500 is about 61.4021622810.

Adding to 231500 its reverse (5132), we get a palindrome (236632).

The spelling of 231500 in words is "two hundred thirty-one thousand, five hundred".