685543 has 4 divisors (see below), whose sum is σ = 695008. Its totient is φ = 676080.

The previous prime is 685541. The next prime is 685547. The reversal of 685543 is 345586.

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 685543 - 2¹ = 685541 is a prime.

It is a d-powerful number, because it can be written as 6² + 8⁶ + 5⁶ + 5⁸ + 4⁷ + 3⁶ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4623 + ... + 4768.

It is an arithmetic number, because the mean of its divisors is an integer number (173752).

2⁶⁸⁵⁵⁴³ is an apocalyptic number.

685543 is a deficient number, since it is larger than the sum of its proper divisors (9465).

685543 is an equidigital number, since it uses as much as digits as its factorization.

685543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9464.

The product of its digits is 14400, while the sum is 31.

The square root of 685543 is about 827.9752411757. The cubic root of 685543 is about 88.1748846550.

The spelling of 685543 in words is "six hundred eighty-five thousand, five hundred forty-three".