205646213 has 2 divisors, whose sum is σ = 205646214. Its totient is φ = 205646212.

The previous prime is 205646149. The next prime is 205646237. The reversal of 205646213 is 312646502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167909764 + 37736449 = 12958^2 + 6143^2 .

It is a cyclic number.

It is not a de Polignac number, because 205646213 - 2⁶ = 205646149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205646113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102823106 + 102823107.

It is an arithmetic number, because the mean of its divisors is an integer number (102823107).

Almost surely, 2^205646213 is an apocalyptic number.

It is an amenable number.

205646213 is a deficient number, since it is larger than the sum of its proper divisors (1).

205646213 is an equidigital number, since it uses as much as digits as its factorization.

205646213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 205646213 is about 14340.3700440400. The cubic root of 205646213 is about 590.2557667297.

The spelling of 205646213 in words is "two hundred five million, six hundred forty-six thousand, two hundred thirteen".