205231 has 4 divisors (see below), whose sum is σ = 221032. Its totient is φ = 189432.

The previous prime is 205223. The next prime is 205237. The reversal of 205231 is 132502.

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

It is a cyclic number.

It is not a de Polignac number, because 205231 - 2³ = 205223 is a prime.

It is a super-2 number, since 2×205231² = 84239526722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15787 = 205231 / (2 + 0 + 5 + 2 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205237) 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, 7881 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (55258).

2²⁰⁵²³¹ is an apocalyptic number.

205231 is a deficient number, since it is larger than the sum of its proper divisors (15801).

205231 is a wasteful number, since it uses less digits than its factorization.

205231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15800.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 205231 is about 453.0242819099. The cubic root of 205231 is about 58.9858244216.

Adding to 205231 its reverse (132502), we get a palindrome (337733).

The spelling of 205231 in words is "two hundred five thousand, two hundred thirty-one".