525689 has 4 divisors (see below), whose sum is σ = 527220. Its totient is φ = 524160.

The previous prime is 525677. The next prime is 525697. The reversal of 525689 is 986525.

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 156025 + 369664 = 395^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 525689 - 2⁸ = 525433 is a prime.

It is a d-powerful number, because it can be written as 5⁴ + 2¹⁹ + 6 + 5⁴ + 8² + 9² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (525649) 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, 17 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (131805).

2⁵²⁵⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

525689 is a deficient number, since it is larger than the sum of its proper divisors (1531).

525689 is a wasteful number, since it uses less digits than its factorization.

525689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530.

The product of its digits is 21600, while the sum is 35.

The square root of 525689 is about 725.0441365876. The cubic root of 525689 is about 80.7067074246.

The spelling of 525689 in words is "five hundred twenty-five thousand, six hundred eighty-nine".