205166791 has 2 divisors, whose sum is σ = 205166792. Its totient is φ = 205166790.

The previous prime is 205166749. The next prime is 205166837. The reversal of 205166791 is 197661502.

205166791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205166791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205166791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205166701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102583395 + 102583396.

It is an arithmetic number, because the mean of its divisors is an integer number (102583396).

Almost surely, 2^205166791 is an apocalyptic number.

205166791 is a deficient number, since it is larger than the sum of its proper divisors (1).

205166791 is an equidigital number, since it uses as much as digits as its factorization.

205166791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 205166791 is about 14323.6444733874. The cubic root of 205166791 is about 589.7967230387.

The spelling of 205166791 in words is "two hundred five million, one hundred sixty-six thousand, seven hundred ninety-one".