205318231 has 16 divisors (see below), whose sum is σ = 229703040. Its totient is φ = 182586880.

The previous prime is 205318229. The next prime is 205318241. The reversal of 205318231 is 132813502.

It is a cyclic number.

It is not a de Polignac number, because 205318231 - 2¹ = 205318229 is a prime.

It is a super-2 number, since 2×205318231² = 84311151961938722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205318196 and 205318205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205318241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18741 + ... + 27601.

It is an arithmetic number, because the mean of its divisors is an integer number (14356440).

Almost surely, 2^205318231 is an apocalyptic number.

205318231 is a deficient number, since it is larger than the sum of its proper divisors (24384809).

205318231 is a wasteful number, since it uses less digits than its factorization.

205318231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8954.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 205318231 is about 14328.9298623449. The cubic root of 205318231 is about 589.9418031269.

The spelling of 205318231 in words is "two hundred five million, three hundred eighteen thousand, two hundred thirty-one".