205717713 has 4 divisors (see below), whose sum is σ = 274290288. Its totient is φ = 137145140.

The previous prime is 205717711. The next prime is 205717777. The reversal of 205717713 is 317717502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205717713 - 2¹ = 205717711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205717711) 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, 34286283 + ... + 34286288.

It is an arithmetic number, because the mean of its divisors is an integer number (68572572).

Almost surely, 2^205717713 is an apocalyptic number.

It is an amenable number.

205717713 is a deficient number, since it is larger than the sum of its proper divisors (68572575).

205717713 is an equidigital number, since it uses as much as digits as its factorization.

205717713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68572574.

The product of its (nonzero) digits is 10290, while the sum is 33.

The square root of 205717713 is about 14342.8627895549. The cubic root of 205717713 is about 590.3241663962.

The spelling of 205717713 in words is "two hundred five million, seven hundred seventeen thousand, seven hundred thirteen".