5643641 has 2 divisors, whose sum is σ = 5643642. Its totient is φ = 5643640.

The previous prime is 5643623. The next prime is 5643653. The reversal of 5643641 is 1463465.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3225616 + 2418025 = 1796^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 5643641 - 2¹⁴ = 5627257 is a prime.

It is not a weakly prime, because it can be changed into another prime (5643601) 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, 2821820 + 2821821.

It is an arithmetic number, because the mean of its divisors is an integer number (2821821).

Almost surely, 2^5643641 is an apocalyptic number.

It is an amenable number.

5643641 is a deficient number, since it is larger than the sum of its proper divisors (1).

5643641 is an equidigital number, since it uses as much as digits as its factorization.

5643641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 5643641 is about 2375.6348625157. The cubic root of 5643641 is about 178.0409050460.

It can be divided in two parts, 5643 and 641, that multiplied together give a palindrome (3617163).

The spelling of 5643641 in words is "five million, six hundred forty-three thousand, six hundred forty-one".