565121 has 4 divisors (see below), whose sum is σ = 568752. Its totient is φ = 561492.

The previous prime is 565111. The next prime is 565127. The reversal of 565121 is 121565.

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 565121 - 2⁶ = 565057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 565093 and 565102.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 565121.

It is not an unprimeable number, because it can be changed into a prime (565127) 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, 1571 + ... + 1896.

It is an arithmetic number, because the mean of its divisors is an integer number (142188).

2⁵⁶⁵¹²¹ is an apocalyptic number.

It is an amenable number.

565121 is a deficient number, since it is larger than the sum of its proper divisors (3631).

565121 is a wasteful number, since it uses less digits than its factorization.

565121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630.

The product of its digits is 300, while the sum is 20.

The square root of 565121 is about 751.7453026125. The cubic root of 565121 is about 82.6761952105.

Adding to 565121 its reverse (121565), we get a palindrome (686686).

Subtracting from 565121 its reverse (121565), we obtain a square (443556 = 666²).

It can be divided in two parts, 565 and 121, that added together give a palindrome (686).

The spelling of 565121 in words is "five hundred sixty-five thousand, one hundred twenty-one".