525818 has 4 divisors (see below), whose sum is σ = 788730. Its totient is φ = 262908.

The previous prime is 525817. The next prime is 525839. The reversal of 525818 is 818525.

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

It can be written as a sum of positive squares in only one way, i.e., 316969 + 208849 = 563^2 + 457^2 .

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 525818.

It is not an unprimeable number, because it can be changed into a prime (525817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131453 + ... + 131456.

2⁵²⁵⁸¹⁸ is an apocalyptic number.

525818 is a deficient number, since it is larger than the sum of its proper divisors (262912).

525818 is a wasteful number, since it uses less digits than its factorization.

525818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262911.

The product of its digits is 3200, while the sum is 29.

The square root of 525818 is about 725.1330912322. The cubic root of 525818 is about 80.7133084846.

The spelling of 525818 in words is "five hundred twenty-five thousand, eight hundred eighteen".