505665241 has 2 divisors, whose sum is σ = 505665242. Its totient is φ = 505665240.

The previous prime is 505665239. The next prime is 505665247. The reversal of 505665241 is 142566505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476505241 + 29160000 = 21829^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 505665241 - 2¹ = 505665239 is a prime.

Together with 505665239, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 505665197 and 505665206.

It is not a weakly prime, because it can be changed into another prime (505665247) 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, 252832620 + 252832621.

It is an arithmetic number, because the mean of its divisors is an integer number (252832621).

Almost surely, 2^505665241 is an apocalyptic number.

It is an amenable number.

505665241 is a deficient number, since it is larger than the sum of its proper divisors (1).

505665241 is an equidigital number, since it uses as much as digits as its factorization.

505665241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 505665241 is about 22487.0016009249. The cubic root of 505665241 is about 796.6869448766.

The spelling of 505665241 in words is "five hundred five million, six hundred sixty-five thousand, two hundred forty-one".