205458217 has 2 divisors, whose sum is σ = 205458218. Its totient is φ = 205458216.

The previous prime is 205458199. The next prime is 205458221. The reversal of 205458217 is 712854502.

It is a happy number.

205458217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205377561 + 80656 = 14331^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 205458217 - 2⁷ = 205458089 is a prime.

It is not a weakly prime, because it can be changed into another prime (205498217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102729108 + 102729109.

It is an arithmetic number, because the mean of its divisors is an integer number (102729109).

Almost surely, 2^205458217 is an apocalyptic number.

It is an amenable number.

205458217 is a deficient number, since it is larger than the sum of its proper divisors (1).

205458217 is an equidigital number, since it uses as much as digits as its factorization.

205458217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 205458217 is about 14333.8137632662. The cubic root of 205458217 is about 590.0758468038.

The spelling of 205458217 in words is "two hundred five million, four hundred fifty-eight thousand, two hundred seventeen".