505386913 has 2 divisors, whose sum is σ = 505386914. Its totient is φ = 505386912.

The previous prime is 505386901. The next prime is 505386919. The reversal of 505386913 is 319683505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355397904 + 149989009 = 18852^2 + 12247^2 .

It is a cyclic number.

It is not a de Polignac number, because 505386913 - 2²⁵ = 471832481 is a prime.

It is not a weakly prime, because it can be changed into another prime (505386919) 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, 252693456 + 252693457.

It is an arithmetic number, because the mean of its divisors is an integer number (252693457).

Almost surely, 2^505386913 is an apocalyptic number.

It is an amenable number.

505386913 is a deficient number, since it is larger than the sum of its proper divisors (1).

505386913 is an equidigital number, since it uses as much as digits as its factorization.

505386913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 505386913 is about 22480.8121072171. The cubic root of 505386913 is about 796.5407473781.

The spelling of 505386913 in words is "five hundred five million, three hundred eighty-six thousand, nine hundred thirteen".