523565 has 12 divisors (see below), whose sum is σ = 731196. Its totient is φ = 358848.

The previous prime is 523553. The next prime is 523571. The reversal of 523565 is 565325.

523565 = T₁₂₁ + T₁₂₂ + ... + T₁₆₉.

It can be written as a sum of positive squares in 2 ways, for example, as 90601 + 432964 = 301^2 + 658^2 .

It is not a de Polignac number, because 523565 - 2¹⁰ = 522541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 824 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (60933).

2⁵²³⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

523565 is a deficient number, since it is larger than the sum of its proper divisors (207631).

523565 is a wasteful number, since it uses less digits than its factorization.

523565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156 (or 2149 counting only the distinct ones).

The product of its digits is 4500, while the sum is 26.

The square root of 523565 is about 723.5779156387. The cubic root of 523565 is about 80.5978645938.

The spelling of 523565 in words is "five hundred twenty-three thousand, five hundred sixty-five".