565591 has 8 divisors (see below), whose sum is σ = 615440. Its totient is φ = 516672.

The previous prime is 565589. The next prime is 565597. The reversal of 565591 is 195565.

It is a happy number.

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

It is not a de Polignac number, because 565591 - 2¹ = 565589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651 + ... + 1963.

It is an arithmetic number, because the mean of its divisors is an integer number (76930).

2⁵⁶⁵⁵⁹¹ is an apocalyptic number.

565591 is a deficient number, since it is larger than the sum of its proper divisors (49849).

565591 is a wasteful number, since it uses less digits than its factorization.

565591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its digits is 6750, while the sum is 31.

The square root of 565591 is about 752.0578435200. The cubic root of 565591 is about 82.6991089135.

It can be divided in two parts, 5655 and 91, that multiplied together give a triangular number (514605 = T₁₀₁₄).

The spelling of 565591 in words is "five hundred sixty-five thousand, five hundred ninety-one".