505565 has 4 divisors (see below), whose sum is σ = 606684. Its totient is φ = 404448.

The previous prime is 505559. The next prime is 505573. The reversal of 505565 is 565505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68644 + 436921 = 262^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 505565 - 2⁶ = 505501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50552 + ... + 50561.

It is an arithmetic number, because the mean of its divisors is an integer number (151671).

2⁵⁰⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

505565 is a deficient number, since it is larger than the sum of its proper divisors (101119).

505565 is a wasteful number, since it uses less digits than its factorization.

505565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101118.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 505565 is about 711.0309416615. The cubic root of 505565 is about 79.6634297415.

The spelling of 505565 in words is "five hundred five thousand, five hundred sixty-five".