205464317 has 2 divisors, whose sum is σ = 205464318. Its totient is φ = 205464316.

The previous prime is 205464299. The next prime is 205464319. The reversal of 205464317 is 713464502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162154756 + 43309561 = 12734^2 + 6581^2 .

It is a cyclic number.

It is not a de Polignac number, because 205464317 - 2⁶ = 205464253 is a prime.

Together with 205464319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205464319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102732158 + 102732159.

It is an arithmetic number, because the mean of its divisors is an integer number (102732159).

Almost surely, 2^205464317 is an apocalyptic number.

It is an amenable number.

205464317 is a deficient number, since it is larger than the sum of its proper divisors (1).

205464317 is an equidigital number, since it uses as much as digits as its factorization.

205464317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 205464317 is about 14334.0265452524. The cubic root of 205464317 is about 590.0816864778.

The spelling of 205464317 in words is "two hundred five million, four hundred sixty-four thousand, three hundred seventeen".