205231243 has 8 divisors (see below), whose sum is σ = 236742912. Its totient is φ = 174267816.

The previous prime is 205231237. The next prime is 205231249. The reversal of 205231243 is 342132502.

205231243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (205231237) and next prime (205231249).

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

It is a cyclic number.

It is not a de Polignac number, because 205231243 - 2⁹ = 205230731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205231249) 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, 136255 + ... + 137752.

It is an arithmetic number, because the mean of its divisors is an integer number (29592864).

Almost surely, 2^205231243 is an apocalyptic number.

205231243 is a deficient number, since it is larger than the sum of its proper divisors (31511669).

205231243 is a wasteful number, since it uses less digits than its factorization.

205231243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274121.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 205231243 is about 14325.8941431242. The cubic root of 205231243 is about 589.8584770200.

Adding to 205231243 its reverse (342132502), we get a palindrome (547363745).

The spelling of 205231243 in words is "two hundred five million, two hundred thirty-one thousand, two hundred forty-three".