565531 has 8 divisors (see below), whose sum is σ = 587264. Its totient is φ = 544320.

The previous prime is 565519. The next prime is 565549. The reversal of 565531 is 135565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(565531) divides (565531-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 565531 - 2¹³ = 557339 is a prime.

It is a super-2 number, since 2×565531² = 639650623922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 565496 and 565505.

It is not an unprimeable number, because it can be changed into a prime (565511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4390 + ... + 4516.

It is an arithmetic number, because the mean of its divisors is an integer number (73408).

2⁵⁶⁵⁵³¹ is an apocalyptic number.

565531 is a deficient number, since it is larger than the sum of its proper divisors (21733).

565531 is a wasteful number, since it uses less digits than its factorization.

565531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its digits is 2250, while the sum is 25.

The square root of 565531 is about 752.0179519134. The cubic root of 565531 is about 82.6961844669.

It can be divided in two parts, 5 and 65531, that added together give a 16-th power (65536 = 2¹⁶).

The spelling of 565531 in words is "five hundred sixty-five thousand, five hundred thirty-one".