505567217 has 2 divisors, whose sum is σ = 505567218. Its totient is φ = 505567216.

The previous prime is 505567151. The next prime is 505567229. The reversal of 505567217 is 712765505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322884961 + 182682256 = 17969^2 + 13516^2 .

It is a cyclic number.

It is not a de Polignac number, because 505567217 - 2²² = 501372913 is a prime.

It is not a weakly prime, because it can be changed into another prime (505567247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252783608 + 252783609.

It is an arithmetic number, because the mean of its divisors is an integer number (252783609).

Almost surely, 2^505567217 is an apocalyptic number.

It is an amenable number.

505567217 is a deficient number, since it is larger than the sum of its proper divisors (1).

505567217 is an equidigital number, since it uses as much as digits as its factorization.

505567217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73500, while the sum is 38.

The square root of 505567217 is about 22484.8219250231. The cubic root of 505567217 is about 796.6354618785.

The spelling of 505567217 in words is "five hundred five million, five hundred sixty-seven thousand, two hundred seventeen".