205861853 has 2 divisors, whose sum is σ = 205861854. Its totient is φ = 205861852.

The previous prime is 205861849. The next prime is 205861879. The reversal of 205861853 is 358168502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149866564 + 55995289 = 12242^2 + 7483^2 .

It is a cyclic number.

It is not a de Polignac number, because 205861853 - 2² = 205861849 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205864853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102930926 + 102930927.

It is an arithmetic number, because the mean of its divisors is an integer number (102930927).

Almost surely, 2^205861853 is an apocalyptic number.

It is an amenable number.

205861853 is a deficient number, since it is larger than the sum of its proper divisors (1).

205861853 is an equidigital number, since it uses as much as digits as its factorization.

205861853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 205861853 is about 14347.8867085017. The cubic root of 205861853 is about 590.4620081320.

The spelling of 205861853 in words is "two hundred five million, eight hundred sixty-one thousand, eight hundred fifty-three".