525645 has 12 divisors (see below), whose sum is σ = 911196. Its totient is φ = 280320.

The previous prime is 525641. The next prime is 525649. The reversal of 525645 is 546525.

It is an interprime number because it is at equal distance from previous prime (525641) and next prime (525649).

It can be written as a sum of positive squares in 2 ways, for example, as 227529 + 298116 = 477^2 + 546^2 .

It is not a de Polignac number, because 525645 - 2² = 525641 is a prime.

It is a super-3 number, since 3×525645³ = 435711344648133375, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525641) 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 11 ways as a sum of consecutive naturals, for example, 5796 + ... + 5885.

It is an arithmetic number, because the mean of its divisors is an integer number (75933).

2⁵²⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

525645 is a deficient number, since it is larger than the sum of its proper divisors (385551).

525645 is a wasteful number, since it uses less digits than its factorization.

525645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11692 (or 11689 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 525645 is about 725.0137929722. The cubic root of 525645 is about 80.7044556533.

The spelling of 525645 in words is "five hundred twenty-five thousand, six hundred forty-five".