6857971 has 2 divisors, whose sum is σ = 6857972. Its totient is φ = 6857970.

The previous prime is 6857969. The next prime is 6857999. The reversal of 6857971 is 1797586.

6857971 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6857971 - 2¹ = 6857969 is a prime.

Together with 6857969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6857471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428985 + 3428986.

It is an arithmetic number, because the mean of its divisors is an integer number (3428986).

Almost surely, 2^6857971 is an apocalyptic number.

6857971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6857971 is an equidigital number, since it uses as much as digits as its factorization.

6857971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 6857971 is about 2618.7728041967. The cubic root of 6857971 is about 189.9904981398.

The spelling of 6857971 in words is "six million, eight hundred fifty-seven thousand, nine hundred seventy-one".