505310642491 has 2 divisors, whose sum is σ = 505310642492. Its totient is φ = 505310642490.

The previous prime is 505310642489. The next prime is 505310642503. The reversal of 505310642491 is 194246013505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505310642491 - 2¹ = 505310642489 is a prime.

Together with 505310642489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (505310649491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252655321245 + 252655321246.

It is an arithmetic number, because the mean of its divisors is an integer number (252655321246).

Almost surely, 2^505310642491 is an apocalyptic number.

505310642491 is a deficient number, since it is larger than the sum of its proper divisors (1).

505310642491 is an equidigital number, since it uses as much as digits as its factorization.

505310642491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 40.

Adding to 505310642491 its reverse (194246013505), we get a palindrome (699556655996).

The spelling of 505310642491 in words is "five hundred five billion, three hundred ten million, six hundred forty-two thousand, four hundred ninety-one".