2109388639 has 2 divisors, whose sum is σ = 2109388640. Its totient is φ = 2109388638.

The previous prime is 2109388571. The next prime is 2109388649. The reversal of 2109388639 is 9368839012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2109388639 - 2¹⁷ = 2109257567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2109388592 and 2109388601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109388649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054694319 + 1054694320.

It is an arithmetic number, because the mean of its divisors is an integer number (1054694320).

Almost surely, 2^2109388639 is an apocalyptic number.

2109388639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109388639 is an equidigital number, since it uses as much as digits as its factorization.

2109388639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 2109388639 is about 45928.0811595695. The cubic root of 2109388639 is about 1282.4847241334.

The spelling of 2109388639 in words is "two billion, one hundred nine million, three hundred eighty-eight thousand, six hundred thirty-nine".