205047617 has 2 divisors, whose sum is σ = 205047618. Its totient is φ = 205047616.

The previous prime is 205047571. The next prime is 205047637. The reversal of 205047617 is 716740502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203889841 + 1157776 = 14279^2 + 1076^2 .

It is a cyclic number.

It is not a de Polignac number, because 205047617 - 2¹⁶ = 204982081 is a prime.

It is not a weakly prime, because it can be changed into another prime (205047637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102523808 + 102523809.

It is an arithmetic number, because the mean of its divisors is an integer number (102523809).

Almost surely, 2^205047617 is an apocalyptic number.

It is an amenable number.

205047617 is a deficient number, since it is larger than the sum of its proper divisors (1).

205047617 is an equidigital number, since it uses as much as digits as its factorization.

205047617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 205047617 is about 14319.4838244959. The cubic root of 205047617 is about 589.6825036954.

The spelling of 205047617 in words is "two hundred five million, forty-seven thousand, six hundred seventeen".