205779011 has 2 divisors, whose sum is σ = 205779012. Its totient is φ = 205779010.

The previous prime is 205778977. The next prime is 205779053. The reversal of 205779011 is 110977502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205779011 - 2¹⁸ = 205516867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (205779061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102889505 + 102889506.

It is an arithmetic number, because the mean of its divisors is an integer number (102889506).

Almost surely, 2^205779011 is an apocalyptic number.

205779011 is a deficient number, since it is larger than the sum of its proper divisors (1).

205779011 is an equidigital number, since it uses as much as digits as its factorization.

205779011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 205779011 is about 14344.9995120251. Note that the first 3 decimals coincide. The cubic root of 205779011 is about 590.3827938177.

The spelling of 205779011 in words is "two hundred five million, seven hundred seventy-nine thousand, eleven".