6871661 has 2 divisors, whose sum is σ = 6871662. Its totient is φ = 6871660.

The previous prime is 6871651. The next prime is 6871679. The reversal of 6871661 is 1661786.

6871661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5851561 + 1020100 = 2419^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 6871661 - 2¹⁸ = 6609517 is a prime.

It is a super-3 number, since 3×6871661³ (a number of 21 digits) contains 333 as substring.

It is a Chen prime.

It is a plaindrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6871651) 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, 3435830 + 3435831.

It is an arithmetic number, because the mean of its divisors is an integer number (3435831).

Almost surely, 2^6871661 is an apocalyptic number.

It is an amenable number.

6871661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6871661 is an equidigital number, since it uses as much as digits as its factorization.

6871661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 6871661 is about 2621.3853207798. The cubic root of 6871661 is about 190.1168348817.

The spelling of 6871661 in words is "six million, eight hundred seventy-one thousand, six hundred sixty-one".