565421 has 4 divisors (see below), whose sum is σ = 595200. Its totient is φ = 535644.

The previous prime is 565393. The next prime is 565427. The reversal of 565421 is 124565.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 565421 - 2¹⁴ = 549037 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 565421.

It is not an unprimeable number, because it can be changed into a prime (565427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14861 + ... + 14898.

It is an arithmetic number, because the mean of its divisors is an integer number (148800).

2⁵⁶⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

565421 is a deficient number, since it is larger than the sum of its proper divisors (29779).

565421 is a wasteful number, since it uses less digits than its factorization.

565421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29778.

The product of its digits is 1200, while the sum is 23.

The square root of 565421 is about 751.9448118047. The cubic root of 565421 is about 82.6908224442.

Adding to 565421 its reverse (124565), we get a palindrome (689986).

The spelling of 565421 in words is "five hundred sixty-five thousand, four hundred twenty-one".