505681609 has 8 divisors (see below), whose sum is σ = 537051168. Its totient is φ = 474492480.

The previous prime is 505681573. The next prime is 505681619. The reversal of 505681609 is 906186505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505681609 - 2⁷ = 505681481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505681619) 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 7 ways as a sum of consecutive naturals, for example, 39307 + ... + 50560.

It is an arithmetic number, because the mean of its divisors is an integer number (67131396).

Almost surely, 2^505681609 is an apocalyptic number.

It is an amenable number.

505681609 is a deficient number, since it is larger than the sum of its proper divisors (31369559).

505681609 is a wasteful number, since it uses less digits than its factorization.

505681609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90215.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 505681609 is about 22487.3655415658. The cubic root of 505681609 is about 796.6955408344.

The spelling of 505681609 in words is "five hundred five million, six hundred eighty-one thousand, six hundred nine".