505894909 has 12 divisors (see below), whose sum is σ = 550120692. Its totient is φ = 465004800.

The previous prime is 505894861. The next prime is 505894927. The reversal of 505894909 is 909498505.

It can be written as a sum of positive squares in 6 ways, for example, as 994009 + 504900900 = 997^2 + 22470^2 .

It is not a de Polignac number, because 505894909 - 2¹⁷ = 505763837 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505894709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34519 + ... + 46939.

It is an arithmetic number, because the mean of its divisors is an integer number (45843391).

Almost surely, 2^505894909 is an apocalyptic number.

It is an amenable number.

505894909 is a deficient number, since it is larger than the sum of its proper divisors (44225783).

505894909 is a wasteful number, since it uses less digits than its factorization.

505894909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12688 (or 12675 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 505894909 is about 22492.1077047039. The cubic root of 505894909 is about 796.8075423179.

The spelling of 505894909 in words is "five hundred five million, eight hundred ninety-four thousand, nine hundred nine".