2105388917 has 16 divisors (see below), whose sum is σ = 2231040000. Its totient is φ = 1981278144.

The previous prime is 2105388913. The next prime is 2105388931. The reversal of 2105388917 is 7198835012.

It is a cyclic number.

It is not a de Polignac number, because 2105388917 - 2² = 2105388913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105388913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2539259 + ... + 2540087.

It is an arithmetic number, because the mean of its divisors is an integer number (139440000).

Almost surely, 2^2105388917 is an apocalyptic number.

It is an amenable number.

2105388917 is a deficient number, since it is larger than the sum of its proper divisors (125651083).

2105388917 is a wasteful number, since it uses less digits than its factorization.

2105388917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 2105388917 is about 45884.5171817248. The cubic root of 2105388917 is about 1281.6736158266.

The spelling of 2105388917 in words is "two billion, one hundred five million, three hundred eighty-eight thousand, nine hundred seventeen".