6857549 has 2 divisors, whose sum is σ = 6857550. Its totient is φ = 6857548.

The previous prime is 6857533. The next prime is 6857551. The reversal of 6857549 is 9457586.

6857549 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6160324 + 697225 = 2482^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 6857549 - 2⁴ = 6857533 is a prime.

It is a Sophie Germain prime.

Together with 6857551, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6857569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428774 + 3428775.

It is an arithmetic number, because the mean of its divisors is an integer number (3428775).

Almost surely, 2^6857549 is an apocalyptic number.

It is an amenable number.

6857549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6857549 is an equidigital number, since it uses as much as digits as its factorization.

6857549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 44.

The square root of 6857549 is about 2618.6922308664. The cubic root of 6857549 is about 189.9866010865.

The spelling of 6857549 in words is "six million, eight hundred fifty-seven thousand, five hundred forty-nine".