2643871 has 2 divisors, whose sum is σ = 2643872. Its totient is φ = 2643870.

The previous prime is 2643853. The next prime is 2643889. The reversal of 2643871 is 1783462.

It is a balanced prime because it is at equal distance from previous prime (2643853) and next prime (2643889).

It is a cyclic number.

It is not a de Polignac number, because 2643871 - 2⁷ = 2643743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643821) 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, 1321935 + 1321936.

It is an arithmetic number, because the mean of its divisors is an integer number (1321936).

2^2643871 is an apocalyptic number.

2643871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643871 is an equidigital number, since it uses as much as digits as its factorization.

2643871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 2643871 is about 1625.9984624839. The cubic root of 2643871 is about 138.2759827428.

The spelling of 2643871 in words is "two million, six hundred forty-three thousand, eight hundred seventy-one".