205095997 has 2 divisors, whose sum is σ = 205095998. Its totient is φ = 205095996.

The previous prime is 205095959. The next prime is 205096027. The reversal of 205095997 is 799590502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200194201 + 4901796 = 14149^2 + 2214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205095997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205095197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102547998 + 102547999.

It is an arithmetic number, because the mean of its divisors is an integer number (102547999).

Almost surely, 2^205095997 is an apocalyptic number.

It is an amenable number.

205095997 is a deficient number, since it is larger than the sum of its proper divisors (1).

205095997 is an equidigital number, since it uses as much as digits as its factorization.

205095997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 255150, while the sum is 46.

The square root of 205095997 is about 14321.1730315641. The cubic root of 205095997 is about 589.7288776328.

The spelling of 205095997 in words is "two hundred five million, ninety-five thousand, nine hundred ninety-seven".