205313243 has 4 divisors (see below), whose sum is σ = 212393040. Its totient is φ = 198233448.

The previous prime is 205313239. The next prime is 205313257. The reversal of 205313243 is 342313502.

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 205313243 - 2² = 205313239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205313263) 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, 3539855 + ... + 3539912.

It is an arithmetic number, because the mean of its divisors is an integer number (53098260).

Almost surely, 2^205313243 is an apocalyptic number.

205313243 is a deficient number, since it is larger than the sum of its proper divisors (7079797).

205313243 is an equidigital number, since it uses as much as digits as its factorization.

205313243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7079796.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 205313243 is about 14328.7558078153. The cubic root of 205313243 is about 589.9370257406.

Adding to 205313243 its reverse (342313502), we get a palindrome (547626745).

The spelling of 205313243 in words is "two hundred five million, three hundred thirteen thousand, two hundred forty-three".