505823081 has 2 divisors, whose sum is σ = 505823082. Its totient is φ = 505823080.

The previous prime is 505823047. The next prime is 505823089. The reversal of 505823081 is 180328505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330657856 + 175165225 = 18184^2 + 13235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505823081 is a prime.

It is a super-2 number, since 2×505823081² = 511713978544665122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (505823089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252911540 + 252911541.

It is an arithmetic number, because the mean of its divisors is an integer number (252911541).

Almost surely, 2^505823081 is an apocalyptic number.

It is an amenable number.

505823081 is a deficient number, since it is larger than the sum of its proper divisors (1).

505823081 is an equidigital number, since it uses as much as digits as its factorization.

505823081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 505823081 is about 22490.5109101594. The cubic root of 505823081 is about 796.7698297416.

The spelling of 505823081 in words is "five hundred five million, eight hundred twenty-three thousand, eighty-one".