525681 has 12 divisors (see below), whose sum is σ = 817908. Its totient is φ = 323424.

The previous prime is 525677. The next prime is 525697. The reversal of 525681 is 186525.

It can be written as a sum of positive squares in 2 ways, for example, as 349281 + 176400 = 591^2 + 420^2 .

It is not a de Polignac number, because 525681 - 2² = 525677 is a prime.

It is a super-2 number, since 2×525681² = 552681027522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

525681 is a lucky 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, 2130 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (68159).

2⁵²⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

525681 is a deficient number, since it is larger than the sum of its proper divisors (292227).

525681 is a wasteful number, since it uses less digits than its factorization.

525681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512 (or 4509 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 525681 is about 725.0386196610. The cubic root of 525681 is about 80.7062980210.

The spelling of 525681 in words is "five hundred twenty-five thousand, six hundred eighty-one".