825009 has 4 divisors (see below), whose sum is σ = 1100016. Its totient is φ = 550004.

The previous prime is 825007. The next prime is 825017. The reversal of 825009 is 900528.

825009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 825009 - 2¹ = 825007 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 825009.

It is not an unprimeable number, because it can be changed into a prime (825001) 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, 137499 + ... + 137504.

It is an arithmetic number, because the mean of its divisors is an integer number (275004).

2⁸²⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

825009 is a deficient number, since it is larger than the sum of its proper divisors (275007).

825009 is a wasteful number, since it uses less digits than its factorization.

825009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275006.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 825009 is about 908.3000605527. The cubic root of 825009 is about 93.7892138176.

The spelling of 825009 in words is "eight hundred twenty-five thousand, nine".