5645639 has 2 divisors, whose sum is σ = 5645640. Its totient is φ = 5645638.

The previous prime is 5645623. The next prime is 5645657. The reversal of 5645639 is 9365465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5645639 - 2⁴ = 5645623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5645609) 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, 2822819 + 2822820.

It is an arithmetic number, because the mean of its divisors is an integer number (2822820).

Almost surely, 2^5645639 is an apocalyptic number.

5645639 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645639 is an equidigital number, since it uses as much as digits as its factorization.

5645639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 38.

The square root of 5645639 is about 2376.0553444733. The cubic root of 5645639 is about 178.0619129826.

The spelling of 5645639 in words is "five million, six hundred forty-five thousand, six hundred thirty-nine".