505216111 has 2 divisors, whose sum is σ = 505216112. Its totient is φ = 505216110.

The previous prime is 505216037. The next prime is 505216121. The reversal of 505216111 is 111612505.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505216111 - 2⁷ = 505215983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505216121) 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, 252608055 + 252608056.

It is an arithmetic number, because the mean of its divisors is an integer number (252608056).

Almost surely, 2^505216111 is an apocalyptic number.

505216111 is a deficient number, since it is larger than the sum of its proper divisors (1).

505216111 is an equidigital number, since it uses as much as digits as its factorization.

505216111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 505216111 is about 22477.0129465639. The cubic root of 505216111 is about 796.4510035411.

Adding to 505216111 its reverse (111612505), we get a palindrome (616828616).

The spelling of 505216111 in words is "five hundred five million, two hundred sixteen thousand, one hundred eleven".