2109798907 has 2 divisors, whose sum is σ = 2109798908. Its totient is φ = 2109798906.

The previous prime is 2109798871. The next prime is 2109798919. The reversal of 2109798907 is 7098979012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2109798907 is a prime.

It is not a weakly prime, because it can be changed into another prime (2109798937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054899453 + 1054899454.

It is an arithmetic number, because the mean of its divisors is an integer number (1054899454).

Almost surely, 2^2109798907 is an apocalyptic number.

2109798907 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109798907 is an equidigital number, since it uses as much as digits as its factorization.

2109798907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 2109798907 is about 45932.5473602325. The cubic root of 2109798907 is about 1282.5678648634.

The spelling of 2109798907 in words is "two billion, one hundred nine million, seven hundred ninety-eight thousand, nine hundred seven".