2109388549 has 2 divisors, whose sum is σ = 2109388550. Its totient is φ = 2109388548.

The previous prime is 2109388513. The next prime is 2109388553. The reversal of 2109388549 is 9458839012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1732057924 + 377330625 = 41618^2 + 19425^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109388549 - 2²⁹ = 1572517637 is a prime.

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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054694274 + 1054694275.

It is an arithmetic number, because the mean of its divisors is an integer number (1054694275).

Almost surely, 2^2109388549 is an apocalyptic number.

It is an amenable number.

2109388549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109388549 is an equidigital number, since it uses as much as digits as its factorization.

2109388549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 2109388549 is about 45928.0801797767. The cubic root of 2109388549 is about 1282.4847058937.

The spelling of 2109388549 in words is "two billion, one hundred nine million, three hundred eighty-eight thousand, five hundred forty-nine".