505770217 has 2 divisors, whose sum is σ = 505770218. Its totient is φ = 505770216.

The previous prime is 505770193. The next prime is 505770227. The reversal of 505770217 is 712077505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385297641 + 120472576 = 19629^2 + 10976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505770217 is a prime.

It is a super-3 number, since 3×505770217³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (505770227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252885108 + 252885109.

It is an arithmetic number, because the mean of its divisors is an integer number (252885109).

Almost surely, 2^505770217 is an apocalyptic number.

It is an amenable number.

505770217 is a deficient number, since it is larger than the sum of its proper divisors (1).

505770217 is an equidigital number, since it uses as much as digits as its factorization.

505770217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17150, while the sum is 34.

The square root of 505770217 is about 22489.3356282483. The cubic root of 505770217 is about 796.7420717439.

The spelling of 505770217 in words is "five hundred five million, seven hundred seventy thousand, two hundred seventeen".