505511 has 2 divisors, whose sum is σ = 505512. Its totient is φ = 505510.

The previous prime is 505501. The next prime is 505513. The reversal of 505511 is 115505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505511 - 2⁶ = 505447 is a prime.

It is a super-2 number, since 2×505511² = 511082742242, which contains 22 as substring.

Together with 505513, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505513) 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, 252755 + 252756.

It is an arithmetic number, because the mean of its divisors is an integer number (252756).

2⁵⁰⁵⁵¹¹ is an apocalyptic number.

505511 is a deficient number, since it is larger than the sum of its proper divisors (1).

505511 is an equidigital number, since it uses as much as digits as its factorization.

505511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 505511 is about 710.9929676164. The cubic root of 505511 is about 79.6605933252.

The spelling of 505511 in words is "five hundred five thousand, five hundred eleven".