505965217 has 4 divisors (see below), whose sum is σ = 512369920. Its totient is φ = 499560516.

The previous prime is 505965209. The next prime is 505965221. The reversal of 505965217 is 712569505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505965217 - 2³ = 505965209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505965217.

It is not an unprimeable number, because it can be changed into a prime (505965277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3202233 + ... + 3202390.

It is an arithmetic number, because the mean of its divisors is an integer number (128092480).

Almost surely, 2^505965217 is an apocalyptic number.

It is an amenable number.

505965217 is a deficient number, since it is larger than the sum of its proper divisors (6404703).

505965217 is an equidigital number, since it uses as much as digits as its factorization.

505965217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6404702.

The product of its (nonzero) digits is 94500, while the sum is 40.

The square root of 505965217 is about 22493.6705986373. The cubic root of 505965217 is about 796.8444533763.

The spelling of 505965217 in words is "five hundred five million, nine hundred sixty-five thousand, two hundred seventeen".