525609 has 28 divisors (see below), whose sum is σ = 909376. Its totient is φ = 297432.

The previous prime is 525607. The next prime is 525641. The reversal of 525609 is 906525.

525609 is a `hidden beast` number, since 52 + 5 + 609 = 666.

525609 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 525609 - 2¹ = 525607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

525609 is strictly pandigital in base 7.

525609 is a lucky number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525607) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5052 + ... + 5154.

2⁵²⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

525609 is a deficient number, since it is larger than the sum of its proper divisors (383767).

525609 is an equidigital number, since it uses as much as digits as its factorization.

525609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 525609 is about 724.9889654333. The cubic root of 525609 is about 80.7026132015.

The spelling of 525609 in words is "five hundred twenty-five thousand, six hundred nine".