205173011 has 2 divisors, whose sum is σ = 205173012. Its totient is φ = 205173010.

The previous prime is 205172969. The next prime is 205173037. The reversal of 205173011 is 110371502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205173011 is a prime.

It is a super-2 number, since 2×205173011² = 84191928885612242, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (205173071) 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, 102586505 + 102586506.

It is an arithmetic number, because the mean of its divisors is an integer number (102586506).

Almost surely, 2^205173011 is an apocalyptic number.

205173011 is a deficient number, since it is larger than the sum of its proper divisors (1).

205173011 is an equidigital number, since it uses as much as digits as its factorization.

205173011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 205173011 is about 14323.8615952543. The cubic root of 205173011 is about 589.8026832277.

The spelling of 205173011 in words is "two hundred five million, one hundred seventy-three thousand, eleven".