6861871 has 4 divisors (see below), whose sum is σ = 6871144. Its totient is φ = 6852600.

The previous prime is 6861851. The next prime is 6861913. The reversal of 6861871 is 1781686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1781686 = 2 ⋅890843.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6861871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6861871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3420 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (1717786).

Almost surely, 2^6861871 is an apocalyptic number.

6861871 is a deficient number, since it is larger than the sum of its proper divisors (9273).

6861871 is an equidigital number, since it uses as much as digits as its factorization.

6861871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9272.

The product of its digits is 16128, while the sum is 37.

The square root of 6861871 is about 2619.5173219507. The cubic root of 6861871 is about 190.0265059974.

The spelling of 6861871 in words is "six million, eight hundred sixty-one thousand, eight hundred seventy-one".