523309 has 4 divisors (see below), whose sum is σ = 528220. Its totient is φ = 518400.

The previous prime is 523307. The next prime is 523333. The reversal of 523309 is 903325.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 334084 + 189225 = 578^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 523309 - 2¹ = 523307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 523309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2292 + ... + 2509.

It is an arithmetic number, because the mean of its divisors is an integer number (132055).

2⁵²³³⁰⁹ is an apocalyptic number.

It is an amenable number.

523309 is a deficient number, since it is larger than the sum of its proper divisors (4911).

523309 is a wasteful number, since it uses less digits than its factorization.

523309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 523309 is about 723.4009952993. The cubic root of 523309 is about 80.5847261951.

The spelling of 523309 in words is "five hundred twenty-three thousand, three hundred nine".