205861847 has 2 divisors, whose sum is σ = 205861848. Its totient is φ = 205861846.

The previous prime is 205861819. The next prime is 205861849. The reversal of 205861847 is 748168502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205861847 - 2⁶ = 205861783 is a prime.

Together with 205861849, 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 (205861849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102930923 + 102930924.

It is an arithmetic number, because the mean of its divisors is an integer number (102930924).

Almost surely, 2^205861847 is an apocalyptic number.

205861847 is a deficient number, since it is larger than the sum of its proper divisors (1).

205861847 is an equidigital number, since it uses as much as digits as its factorization.

205861847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 205861847 is about 14347.8864994117. The cubic root of 205861847 is about 590.4620023955.

The spelling of 205861847 in words is "two hundred five million, eight hundred sixty-one thousand, eight hundred forty-seven".