505522217 has 4 divisors (see below), whose sum is σ = 535258836. Its totient is φ = 475785600.

The previous prime is 505522211. The next prime is 505522219. The reversal of 505522217 is 712225505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146192281 + 359329936 = 12091^2 + 18956^2 .

It is a cyclic number.

It is not a de Polignac number, because 505522217 - 2¹² = 505518121 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 505522217.

It is not an unprimeable number, because it can be changed into a prime (505522211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14868284 + ... + 14868317.

It is an arithmetic number, because the mean of its divisors is an integer number (133814709).

Almost surely, 2^505522217 is an apocalyptic number.

It is an amenable number.

505522217 is a deficient number, since it is larger than the sum of its proper divisors (29736619).

505522217 is a wasteful number, since it uses less digits than its factorization.

505522217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29736618.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 505522217 is about 22483.8212277184. The cubic root of 505522217 is about 796.6118252856.

It can be divided in two parts, 5055 and 22217, that added together give a palindrome (27272).

The spelling of 505522217 in words is "five hundred five million, five hundred twenty-two thousand, two hundred seventeen".