5645642939 has 2 divisors, whose sum is σ = 5645642940. Its totient is φ = 5645642938.

The previous prime is 5645642923. The next prime is 5645642953. The reversal of 5645642939 is 9392465465.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5645642939 - 2⁴ = 5645642923 is a prime.

It is not a weakly prime, because it can be changed into another prime (5645645939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822821469 + 2822821470.

It is an arithmetic number, because the mean of its divisors is an integer number (2822821470).

Almost surely, 2^5645642939 is an apocalyptic number.

5645642939 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645642939 is an equidigital number, since it uses as much as digits as its factorization.

5645642939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 53.

The square root of 5645642939 is about 75137.4935634667. The cubic root of 5645642939 is about 1780.6195439428.

The spelling of 5645642939 in words is "five billion, six hundred forty-five million, six hundred forty-two thousand, nine hundred thirty-nine".