565649 has 8 divisors (see below), whose sum is σ = 680640. Its totient is φ = 459216.

The previous prime is 565637. The next prime is 565651. The reversal of 565649 is 946565.

It is a happy number.

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 565649 - 2⁸ = 565393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (565049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1994 + ... + 2259.

It is an arithmetic number, because the mean of its divisors is an integer number (85080).

2⁵⁶⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

565649 is a deficient number, since it is larger than the sum of its proper divisors (114991).

565649 is a wasteful number, since it uses less digits than its factorization.

565649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279.

The product of its digits is 32400, while the sum is 35.

The square root of 565649 is about 752.0964033952. The cubic root of 565649 is about 82.7019356819.

The spelling of 565649 in words is "five hundred sixty-five thousand, six hundred forty-nine".