231365 has 4 divisors (see below), whose sum is σ = 277644. Its totient is φ = 185088.

The previous prime is 231359. The next prime is 231367. The reversal of 231365 is 563132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82369 + 148996 = 287^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 231365 - 2⁴ = 231349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231365.

It is not an unprimeable number, because it can be changed into a prime (231367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23132 + ... + 23141.

It is an arithmetic number, because the mean of its divisors is an integer number (69411).

2²³¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

231365 is a deficient number, since it is larger than the sum of its proper divisors (46279).

231365 is an equidigital number, since it uses as much as digits as its factorization.

231365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46278.

The product of its digits is 540, while the sum is 20.

The square root of 231365 is about 481.0041579862. The cubic root of 231365 is about 61.3902243347.

Adding to 231365 its reverse (563132), we get a palindrome (794497).

The spelling of 231365 in words is "two hundred thirty-one thousand, three hundred sixty-five".