2105991186 has 16 divisors (see below), whose sum is σ = 4535981184. Its totient is φ = 647997264.

The previous prime is 2105991163. The next prime is 2105991187. The reversal of 2105991186 is 6811995012.

It is not an unprimeable number, because it can be changed into a prime (2105991187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13499866 + ... + 13500021.

It is an arithmetic number, because the mean of its divisors is an integer number (283498824).

Almost surely, 2^2105991186 is an apocalyptic number.

2105991186 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2105991186 is an abundant number, since it is smaller than the sum of its proper divisors (2429989998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2105991186 is a wasteful number, since it uses less digits than its factorization.

2105991186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26999905.

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 2105991186 is about 45891.0795907004. The cubic root of 2105991186 is about 1281.7958163201.

The spelling of 2105991186 in words is "two billion, one hundred five million, nine hundred ninety-one thousand, one hundred eighty-six".