525909 has 4 divisors (see below), whose sum is σ = 701216. Its totient is φ = 350604.

The previous prime is 525893. The next prime is 525913. The reversal of 525909 is 909525.

525909 is digitally balanced in base 7, 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 not a de Polignac number, because 525909 - 2⁴ = 525893 is a prime.

It is a D-number.

It is a Duffinian number.

525909 is strictly pandigital in base 7.

It is a Curzon number.

525909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87649 + ... + 87654.

It is an arithmetic number, because the mean of its divisors is an integer number (175304).

2⁵²⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

525909 is a deficient number, since it is larger than the sum of its proper divisors (175307).

525909 is a wasteful number, since it uses less digits than its factorization.

525909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175306.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 525909 is about 725.1958356196. The cubic root of 525909 is about 80.7179643968.

The spelling of 525909 in words is "five hundred twenty-five thousand, nine hundred nine".