505505831 has 2 divisors, whose sum is σ = 505505832. Its totient is φ = 505505830.

The previous prime is 505505711. The next prime is 505505857. The reversal of 505505831 is 138505505.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505505831 is a prime.

It is a super-2 number, since 2×505505831² = 511072290350001122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505505881) 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, 252752915 + 252752916.

It is an arithmetic number, because the mean of its divisors is an integer number (252752916).

Almost surely, 2^505505831 is an apocalyptic number.

505505831 is a deficient number, since it is larger than the sum of its proper divisors (1).

505505831 is an equidigital number, since it uses as much as digits as its factorization.

505505831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15000, while the sum is 32.

The square root of 505505831 is about 22483.4568294113. The cubic root of 505505831 is about 796.6032180659.

The spelling of 505505831 in words is "five hundred five million, five hundred five thousand, eight hundred thirty-one".