531565 has 8 divisors (see below), whose sum is σ = 653688. Its totient is φ = 414720.

The previous prime is 531551. The next prime is 531569. The reversal of 531565 is 565135.

531565 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 4 ways, for example, as 4489 + 527076 = 67^2 + 726^2 .

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

It is not a de Polignac number, because 531565 - 2¹¹ = 529517 is a prime.

It is a super-2 number, since 2×531565² = 565122698450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531569) 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, 1092 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (81711).

2⁵³¹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

531565 is a deficient number, since it is larger than the sum of its proper divisors (122123).

531565 is a wasteful number, since it uses less digits than its factorization.

531565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639.

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

The square root of 531565 is about 729.0850430505. The cubic root of 531565 is about 81.0062993628.

The spelling of 531565 in words is "five hundred thirty-one thousand, five hundred sixty-five".