2109387191 has 2 divisors, whose sum is σ = 2109387192. Its totient is φ = 2109387190.

The previous prime is 2109387167. The next prime is 2109387199. The reversal of 2109387191 is 1917839012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2109387191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109387199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054693595 + 1054693596.

It is an arithmetic number, because the mean of its divisors is an integer number (1054693596).

Almost surely, 2^2109387191 is an apocalyptic number.

2109387191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109387191 is an equidigital number, since it uses as much as digits as its factorization.

2109387191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 2109387191 is about 45928.0653957904. The cubic root of 2109387191 is about 1282.4844306773.

The spelling of 2109387191 in words is "two billion, one hundred nine million, three hundred eighty-seven thousand, one hundred ninety-one".