6856631 has 2 divisors, whose sum is σ = 6856632. Its totient is φ = 6856630.

The previous prime is 6856621. The next prime is 6856643. The reversal of 6856631 is 1366586.

6856631 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 a de Polignac number, because none of the positive numbers 2^k-6856631 is a prime.

It is a super-2 number, since 2×6856631² = 94026777340322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6856591 and 6856600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6856601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428315 + 3428316.

It is an arithmetic number, because the mean of its divisors is an integer number (3428316).

Almost surely, 2^6856631 is an apocalyptic number.

6856631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856631 is an equidigital number, since it uses as much as digits as its factorization.

6856631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 6856631 is about 2618.5169466704. The cubic root of 6856631 is about 189.9781230582.

The spelling of 6856631 in words is "six million, eight hundred fifty-six thousand, six hundred thirty-one".