525643 has 4 divisors (see below), whose sum is σ = 531160. Its totient is φ = 520128.

The previous prime is 525641. The next prime is 525649. The reversal of 525643 is 346525.

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

It is a cyclic number.

It is not a de Polignac number, because 525643 - 2¹ = 525641 is a prime.

It is a d-powerful number, because it can be written as 5² + 2¹⁸ + 6⁴ + 5² + 4⁹ + 3² .

It is a Duffinian number.

525643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (525641) 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, 2613 + ... + 2806.

It is an arithmetic number, because the mean of its divisors is an integer number (132790).

2⁵²⁵⁶⁴³ is an apocalyptic number.

525643 is a deficient number, since it is larger than the sum of its proper divisors (5517).

525643 is an equidigital number, since it uses as much as digits as its factorization.

525643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516.

The product of its digits is 3600, while the sum is 25.

The square root of 525643 is about 725.0124136868. The cubic root of 525643 is about 80.7043532971.

The spelling of 525643 in words is "five hundred twenty-five thousand, six hundred forty-three".