505020317 has 2 divisors, whose sum is σ = 505020318. Its totient is φ = 505020316.

The previous prime is 505020169. The next prime is 505020359. The reversal of 505020317 is 713020505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421645156 + 83375161 = 20534^2 + 9131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505020317 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 505020292 and 505020301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505020917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252510158 + 252510159.

It is an arithmetic number, because the mean of its divisors is an integer number (252510159).

Almost surely, 2^505020317 is an apocalyptic number.

It is an amenable number.

505020317 is a deficient number, since it is larger than the sum of its proper divisors (1).

505020317 is an equidigital number, since it uses as much as digits as its factorization.

505020317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 505020317 is about 22472.6570970146. The cubic root of 505020317 is about 796.3481033674.

The spelling of 505020317 in words is "five hundred five million, twenty thousand, three hundred seventeen".