523009 has 4 divisors (see below), whose sum is σ = 535216. Its totient is φ = 510804.

The previous prime is 523007. The next prime is 523021. The reversal of 523009 is 900325.

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 523009 - 2¹ = 523007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (523007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6039 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (133804).

2⁵²³⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

523009 is a deficient number, since it is larger than the sum of its proper divisors (12207).

523009 is a wasteful number, since it uses less digits than its factorization.

523009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12206.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 523009 is about 723.1936116974. The cubic root of 523009 is about 80.5693241802.

The spelling of 523009 in words is "five hundred twenty-three thousand, nine".