30565 has 4 divisors (see below), whose sum is σ = 36684. Its totient is φ = 24448.

The previous prime is 30559. The next prime is 30577. The reversal of 30565 is 56503.

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 13924 + 16641 = 118^2 + 129^2 .

It is a cyclic number.

It is not a de Polignac number, because 30565 - 2³ = 30557 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

30565 is a lucky number.

It is a nialpdrome in base 16.

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, 3052 + ... + 3061.

It is an arithmetic number, because the mean of its divisors is an integer number (9171).

2³⁰⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

30565 is a deficient number, since it is larger than the sum of its proper divisors (6119).

30565 is an equidigital number, since it uses as much as digits as its factorization.

30565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6118.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 30565 is about 174.8284873812. The cubic root of 30565 is about 31.2661782896.

It can be divided in two parts, 30 and 565, that added together give a palindrome (595).

The spelling of 30565 in words is "thirty thousand, five hundred sixty-five".