525989 has 4 divisors (see below), whose sum is σ = 538860. Its totient is φ = 513120.

The previous prime is 525983. The next prime is 526027. The reversal of 525989 is 989525.

It is a happy number.

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 195364 + 330625 = 442^2 + 575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525983) 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, 6374 + ... + 6455.

It is an arithmetic number, because the mean of its divisors is an integer number (134715).

2⁵²⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

525989 is a deficient number, since it is larger than the sum of its proper divisors (12871).

525989 is a wasteful number, since it uses less digits than its factorization.

525989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870.

The product of its digits is 32400, while the sum is 38.

The square root of 525989 is about 725.2509910369. The cubic root of 525989 is about 80.7220570629.

The spelling of 525989 in words is "five hundred twenty-five thousand, nine hundred eighty-nine".