6856491 has 16 divisors (see below), whose sum is σ = 9738144. Its totient is φ = 4276224.

The previous prime is 6856483. The next prime is 6856517. The reversal of 6856491 is 1946586.

It is not a de Polignac number, because 6856491 - 2³ = 6856483 is a prime.

It is a super-2 number, since 2×6856491² = 94022937666162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6856411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11595 + ... + 12171.

It is an arithmetic number, because the mean of its divisors is an integer number (608634).

Almost surely, 2^6856491 is an apocalyptic number.

6856491 is a deficient number, since it is larger than the sum of its proper divisors (2881653).

6856491 is a wasteful number, since it uses less digits than its factorization.

6856491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

The product of its digits is 51840, while the sum is 39.

The square root of 6856491 is about 2618.4902138446. The cubic root of 6856491 is about 189.9768300463.

The spelling of 6856491 in words is "six million, eight hundred fifty-six thousand, four hundred ninety-one".