505530881 has 2 divisors, whose sum is σ = 505530882. Its totient is φ = 505530880.

The previous prime is 505530827. The next prime is 505530911. The reversal of 505530881 is 188035505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505530256 + 625 = 22484^2 + 25^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505530881 is a prime.

It is a super-2 number, since 2×505530881² = 511122943289272322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (505530481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252765440 + 252765441.

It is an arithmetic number, because the mean of its divisors is an integer number (252765441).

Almost surely, 2^505530881 is an apocalyptic number.

It is an amenable number.

505530881 is a deficient number, since it is larger than the sum of its proper divisors (1).

505530881 is an equidigital number, since it uses as much as digits as its factorization.

505530881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 505530881 is about 22484.0138987682. The cubic root of 505530881 is about 796.6163762267.

The spelling of 505530881 in words is "five hundred five million, five hundred thirty thousand, eight hundred eighty-one".