205520411 has 2 divisors, whose sum is σ = 205520412. Its totient is φ = 205520410.

The previous prime is 205520377. The next prime is 205520431. The reversal of 205520411 is 114025502.

It is an a-pointer prime, because the next prime (205520431) can be obtained adding 205520411 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205520411 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (205520431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102760205 + 102760206.

It is an arithmetic number, because the mean of its divisors is an integer number (102760206).

Almost surely, 2^205520411 is an apocalyptic number.

205520411 is a deficient number, since it is larger than the sum of its proper divisors (1).

205520411 is an equidigital number, since it uses as much as digits as its factorization.

205520411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 205520411 is about 14335.9830845324. The cubic root of 205520411 is about 590.1353811710.

Adding to 205520411 its reverse (114025502), we get a palindrome (319545913).

The spelling of 205520411 in words is "two hundred five million, five hundred twenty thousand, four hundred eleven".