231345 has 24 divisors (see below), whose sum is σ = 412776. Its totient is φ = 119808.

The previous prime is 231331. The next prime is 231347. The reversal of 231345 is 543132.

It can be written as a sum of positive squares in 4 ways, for example, as 36864 + 194481 = 192^2 + 441^2 .

It is not a de Polignac number, because 231345 - 2⁹ = 230833 is a prime.

231345 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (231347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2337 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (17199).

2²³¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

231345 is a deficient number, since it is larger than the sum of its proper divisors (181431).

231345 is a wasteful number, since it uses less digits than its factorization.

231345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 158 counting only the distinct ones).

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

The square root of 231345 is about 480.9833676958. The cubic root of 231345 is about 61.3884553551.

Adding to 231345 its reverse (543132), we get a palindrome (774477).

It can be divided in two parts, 231 and 345, that added together give a square (576 = 24²).

The spelling of 231345 in words is "two hundred thirty-one thousand, three hundred forty-five".