5640871 has 2 divisors, whose sum is σ = 5640872. Its totient is φ = 5640870.

The previous prime is 5640863. The next prime is 5640881. The reversal of 5640871 is 1780465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5640871 - 2³ = 5640863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5640881) 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 as a sum of consecutive naturals, namely, 2820435 + 2820436.

It is an arithmetic number, because the mean of its divisors is an integer number (2820436).

Almost surely, 2^5640871 is an apocalyptic number.

5640871 is a deficient number, since it is larger than the sum of its proper divisors (1).

5640871 is an equidigital number, since it uses as much as digits as its factorization.

5640871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 5640871 is about 2375.0517889090. The cubic root of 5640871 is about 178.0117717250.

The spelling of 5640871 in words is "five million, six hundred forty thousand, eight hundred seventy-one".