525009 has 4 divisors (see below), whose sum is σ = 700016. Its totient is φ = 350004.

The previous prime is 525001. The next prime is 525013. The reversal of 525009 is 900525.

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 not a de Polignac number, because 525009 - 2³ = 525001 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87499 + ... + 87504.

It is an arithmetic number, because the mean of its divisors is an integer number (175004).

2⁵²⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

525009 is a deficient number, since it is larger than the sum of its proper divisors (175007).

525009 is a wasteful number, since it uses less digits than its factorization.

525009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175006.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 525009 is about 724.5750478729. The cubic root of 525009 is about 80.6718932782.

The spelling of 525009 in words is "five hundred twenty-five thousand, nine".