6856517 has 2 divisors, whose sum is σ = 6856518. Its totient is φ = 6856516.

The previous prime is 6856483. The next prime is 6856523. The reversal of 6856517 is 7156586.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4879681 + 1976836 = 2209^2 + 1406^2 .

It is a cyclic number.

It is not a de Polignac number, because 6856517 - 2⁸ = 6856261 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6856537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428258 + 3428259.

It is an arithmetic number, because the mean of its divisors is an integer number (3428259).

Almost surely, 2^6856517 is an apocalyptic number.

It is an amenable number.

6856517 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856517 is an equidigital number, since it uses as much as digits as its factorization.

6856517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The square root of 6856517 is about 2618.4951785329. The cubic root of 6856517 is about 189.9770701784.

The spelling of 6856517 in words is "six million, eight hundred fifty-six thousand, five hundred seventeen".