565551 has 24 divisors (see below), whose sum is σ = 958464. Its totient is φ = 314640.

The previous prime is 565549. The next prime is 565553. The reversal of 565551 is 155565.

565551 is a `hidden beast` number, since 5 + 655 + 5 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (565549) and next prime (565553).

It is not a de Polignac number, because 565551 - 2¹ = 565549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2866 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (39936).

2⁵⁶⁵⁵⁵¹ is an apocalyptic number.

565551 is a deficient number, since it is larger than the sum of its proper divisors (392913).

565551 is a wasteful number, since it uses less digits than its factorization.

565551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 248 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 565551 is about 752.0312493507. The cubic root of 565551 is about 82.6971593054.

It can be divided in two parts, 5 and 65551, that added together give a palindrome (65556).

The spelling of 565551 in words is "five hundred sixty-five thousand, five hundred fifty-one".