525865 has 4 divisors (see below), whose sum is σ = 631044. Its totient is φ = 420688.

The previous prime is 525839. The next prime is 525869. The reversal of 525865 is 568525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151321 + 374544 = 389^2 + 612^2 .

It is a cyclic number.

It is not a de Polignac number, because 525865 - 2⁹ = 525353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525869) 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, 52582 + ... + 52591.

It is an arithmetic number, because the mean of its divisors is an integer number (157761).

2⁵²⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

525865 is a deficient number, since it is larger than the sum of its proper divisors (105179).

525865 is a wasteful number, since it uses less digits than its factorization.

525865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105178.

The product of its digits is 12000, while the sum is 31.

The square root of 525865 is about 725.1654983519. The cubic root of 525865 is about 80.7157132536.

The spelling of 525865 in words is "five hundred twenty-five thousand, eight hundred sixty-five".