2109187187 has 2 divisors, whose sum is σ = 2109187188. Its totient is φ = 2109187186.

The previous prime is 2109187159. The next prime is 2109187259. The reversal of 2109187187 is 7817819012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2109187187 - 2⁸ = 2109186931 is a prime.

It is not a weakly prime, because it can be changed into another prime (2109187117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054593593 + 1054593594.

It is an arithmetic number, because the mean of its divisors is an integer number (1054593594).

Almost surely, 2^2109187187 is an apocalyptic number.

2109187187 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109187187 is an equidigital number, since it uses as much as digits as its factorization.

2109187187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 44.

The square root of 2109187187 is about 45925.8879827054. The cubic root of 2109187187 is about 1282.4438959785.

The spelling of 2109187187 in words is "two billion, one hundred nine million, one hundred eighty-seven thousand, one hundred eighty-seven".