231000 has 128 divisors (see below), whose sum is σ = 898560. Its totient is φ = 48000.

The previous prime is 230999. The next prime is 231001. The reversal of 231000 is 132.

It is an interprime number because it is at equal distance from previous prime (230999) and next prime (231001).

It is a super-2 number, since 2×231000² = 106722000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a self number, because there is not a number n which added to its sum of digits gives 231000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20995 + ... + 21005.

It is an arithmetic number, because the mean of its divisors is an integer number (7020).

2²³¹⁰⁰⁰ is an apocalyptic number.

231000 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 231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449280).

231000 is an abundant number, since it is smaller than the sum of its proper divisors (667560).

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

231000 is a wasteful number, since it uses less digits than its factorization.

231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 231000 is about 480.6245936279. The cubic root of 231000 is about 61.3579243966.

Adding to 231000 its reverse (132), we get a palindrome (231132).

The spelling of 231000 in words is "two hundred thirty-one thousand".