505288865 has 4 divisors (see below), whose sum is σ = 606346644. Its totient is φ = 404231088.

The previous prime is 505288843. The next prime is 505288873. The reversal of 505288865 is 568882505.

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 132181009 + 373107856 = 11497^2 + 19316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505288865 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 50528882 + ... + 50528891.

It is an arithmetic number, because the mean of its divisors is an integer number (151586661).

Almost surely, 2^505288865 is an apocalyptic number.

It is an amenable number.

505288865 is a deficient number, since it is larger than the sum of its proper divisors (101057779).

505288865 is a wasteful number, since it uses less digits than its factorization.

505288865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101057778.

The product of its (nonzero) digits is 768000, while the sum is 47.

The square root of 505288865 is about 22478.6312973010. The cubic root of 505288865 is about 796.4892328676.

The spelling of 505288865 in words is "five hundred five million, two hundred eighty-eight thousand, eight hundred sixty-five".