525999 has 4 divisors (see below), whose sum is σ = 701336. Its totient is φ = 350664.

The previous prime is 525983. The next prime is 526027. The reversal of 525999 is 999525.

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

It is not a de Polignac number, because 525999 - 2⁴ = 525983 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

525999 is a modest number, since divided by 999 gives 525 as remainder.

It is a plaindrome in base 13.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525949) 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, 87664 + ... + 87669.

It is an arithmetic number, because the mean of its divisors is an integer number (175334).

2⁵²⁵⁹⁹⁹ is an apocalyptic number.

525999 is a deficient number, since it is larger than the sum of its proper divisors (175337).

525999 is a wasteful number, since it uses less digits than its factorization.

525999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175336.

The product of its digits is 36450, while the sum is 39.

The square root of 525999 is about 725.2578851691. The cubic root of 525999 is about 80.7225686170.

The spelling of 525999 in words is "five hundred twenty-five thousand, nine hundred ninety-nine".