6856543 has 2 divisors, whose sum is σ = 6856544. Its totient is φ = 6856542.

The previous prime is 6856537. The next prime is 6856561. The reversal of 6856543 is 3456586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6856543 - 2¹³ = 6848351 is a prime.

It is a d-powerful number, because it can be written as 6⁷ + 8⁵ + 5⁵ + 6⁸ + 5⁷ + 4 + 3¹⁴ .

It is the 2619-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6856523) by changing a digit.

It is a nontrivial repunit in base 2618.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428271 + 3428272.

It is an arithmetic number, because the mean of its divisors is an integer number (3428272).

Almost surely, 2^6856543 is an apocalyptic number.

6856543 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856543 is an equidigital number, since it uses as much as digits as its factorization.

6856543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 37.

The square root of 6856543 is about 2618.5001432118. The cubic root of 6856543 is about 189.9773103099.

The spelling of 6856543 in words is "six million, eight hundred fifty-six thousand, five hundred forty-three".