205655117 has 2 divisors, whose sum is σ = 205655118. Its totient is φ = 205655116.

The previous prime is 205655113. The next prime is 205655119. The reversal of 205655117 is 711556502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189502756 + 16152361 = 13766^2 + 4019^2 .

It is a cyclic number.

It is not a de Polignac number, because 205655117 - 2² = 205655113 is a prime.

Together with 205655119, 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 (205655113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102827558 + 102827559.

It is an arithmetic number, because the mean of its divisors is an integer number (102827559).

Almost surely, 2^205655117 is an apocalyptic number.

It is an amenable number.

205655117 is a deficient number, since it is larger than the sum of its proper divisors (1).

205655117 is an equidigital number, since it uses as much as digits as its factorization.

205655117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 205655117 is about 14340.6804929194. The cubic root of 205655117 is about 590.2642855048.

The spelling of 205655117 in words is "two hundred five million, six hundred fifty-five thousand, one hundred seventeen".