231546 has 32 divisors (see below), whose sum is σ = 547200. Its totient is φ = 63936.

The previous prime is 231533. The next prime is 231547. The reversal of 231546 is 645132.

It is a happy number.

231546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231546² = 107227100232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

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

231546 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 15 ways as a sum of consecutive naturals, for example, 1480 + ... + 1628.

It is an arithmetic number, because the mean of its divisors is an integer number (17100).

2²³¹⁵⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273600).

231546 is an abundant number, since it is smaller than the sum of its proper divisors (315654).

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

231546 is a wasteful number, since it uses less digits than its factorization.

231546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198.

The product of its digits is 720, while the sum is 21.

The square root of 231546 is about 481.1922692646. The cubic root of 231546 is about 61.4062289655.

231546 divided by its sum of digits (21) gives a triangular number (11026 = T₁₄₈).

Adding to 231546 its reverse (645132), we get a palindrome (876678).

It can be divided in two parts, 231 and 546, that added together give a palindrome (777).

The spelling of 231546 in words is "two hundred thirty-one thousand, five hundred forty-six".