6871813 has 8 divisors (see below), whose sum is σ = 7421400. Its totient is φ = 6325248.

The previous prime is 6871807. The next prime is 6871829. The reversal of 6871813 is 3181786.

It can be written as a sum of positive squares in 4 ways, for example, as 636804 + 6235009 = 798^2 + 2497^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6871813 - 2⁹ = 6871301 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6871913) 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 in 7 ways as a sum of consecutive naturals, for example, 6933 + ... + 7861.

It is an arithmetic number, because the mean of its divisors is an integer number (927675).

Almost surely, 2^6871813 is an apocalyptic number.

It is an amenable number.

6871813 is a deficient number, since it is larger than the sum of its proper divisors (549587).

6871813 is a wasteful number, since it uses less digits than its factorization.

6871813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511.

The product of its digits is 8064, while the sum is 34.

The square root of 6871813 is about 2621.4143129235. The cubic root of 6871813 is about 190.1182366556.

It can be divided in two parts, 687 and 1813, that added together give a square (2500 = 50²).

The spelling of 6871813 in words is "six million, eight hundred seventy-one thousand, eight hundred thirteen".