2105996309 has 4 divisors (see below), whose sum is σ = 2216838240. Its totient is φ = 1995154380.

The previous prime is 2105996293. The next prime is 2105996317. The reversal of 2105996309 is 9036995012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2105996309 - 2⁴ = 2105996293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105996309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105996609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55420937 + ... + 55420974.

It is an arithmetic number, because the mean of its divisors is an integer number (554209560).

Almost surely, 2^2105996309 is an apocalyptic number.

It is an amenable number.

2105996309 is a deficient number, since it is larger than the sum of its proper divisors (110841931).

2105996309 is a wasteful number, since it uses less digits than its factorization.

2105996309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110841930.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 2105996309 is about 45891.1354076144. The cubic root of 2105996309 is about 1281.7968556778.

The spelling of 2105996309 in words is "two billion, one hundred five million, nine hundred ninety-six thousand, three hundred nine".