6871639 has 2 divisors, whose sum is σ = 6871640. Its totient is φ = 6871638.

The previous prime is 6871583. The next prime is 6871651. The reversal of 6871639 is 9361786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6871639 - 2⁷ = 6871511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6871679) 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 as a sum of consecutive naturals, namely, 3435819 + 3435820.

It is an arithmetic number, because the mean of its divisors is an integer number (3435820).

Almost surely, 2^6871639 is an apocalyptic number.

6871639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6871639 is an equidigital number, since it uses as much as digits as its factorization.

6871639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 6871639 is about 2621.3811245220. The cubic root of 6871639 is about 190.1166319916.

The spelling of 6871639 in words is "six million, eight hundred seventy-one thousand, six hundred thirty-nine".