231845 has 8 divisors (see below), whose sum is σ = 281880. Its totient is φ = 183040.

The previous prime is 231841. The next prime is 231859. The reversal of 231845 is 548132.

231845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 484 + 231361 = 22^2 + 481^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231845 - 2² = 231841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185 + ... + 705.

It is an arithmetic number, because the mean of its divisors is an integer number (35235).

2²³¹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

231845 is a deficient number, since it is larger than the sum of its proper divisors (50035).

231845 is an equidigital number, since it uses as much as digits as its factorization.

231845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615.

The product of its digits is 960, while the sum is 23.

The square root of 231845 is about 481.5028556509. The cubic root of 231845 is about 61.4326492953.

Adding to 231845 its reverse (548132), we get a palindrome (779977).

The spelling of 231845 in words is "two hundred thirty-one thousand, eight hundred forty-five".