231543 has 12 divisors (see below), whose sum is σ = 360360. Its totient is φ = 142416.

The previous prime is 231533. The next prime is 231547. The reversal of 231543 is 345132.

231543 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231543 - 2⁶ = 231479 is a prime.

It is a super-2 number, since 2×231543² = 107224321698, which contains 22 as substring.

231543 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 873 + ... + 1106.

It is an arithmetic number, because the mean of its divisors is an integer number (30030).

2²³¹⁵⁴³ is an apocalyptic number.

231543 is a deficient number, since it is larger than the sum of its proper divisors (128817).

231543 is a wasteful number, since it uses less digits than its factorization.

231543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998 (or 1995 counting only the distinct ones).

The product of its digits is 360, while the sum is 18.

The square root of 231543 is about 481.1891519974. The cubic root of 231543 is about 61.4059637634.

Adding to 231543 its reverse (345132), we get a palindrome (576675).

The spelling of 231543 in words is "two hundred thirty-one thousand, five hundred forty-three".