505500211 has 2 divisors, whose sum is σ = 505500212. Its totient is φ = 505500210.

The previous prime is 505500197. The next prime is 505500241. The reversal of 505500211 is 112005505.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505500211 is a prime.

It is not a weakly prime, because it can be changed into another prime (505500241) 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, 252750105 + 252750106.

It is an arithmetic number, because the mean of its divisors is an integer number (252750106).

Almost surely, 2^505500211 is an apocalyptic number.

505500211 is a deficient number, since it is larger than the sum of its proper divisors (1).

505500211 is an equidigital number, since it uses as much as digits as its factorization.

505500211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 505500211 is about 22483.3318482826. The cubic root of 505500211 is about 796.6002659557.

Adding to 505500211 its reverse (112005505), we get a palindrome (617505716).

The spelling of 505500211 in words is "five hundred five million, five hundred thousand, two hundred eleven".