2105843391 has 6 divisors (see below), whose sum is σ = 3041773800. Its totient is φ = 1403895588.

The previous prime is 2105843357. The next prime is 2105843401. The reversal of 2105843391 is 1933485012.

2105843391 is a `hidden beast` number, since 210 + 5 + 8 + 433 + 9 + 1 = 666.

It is not a de Polignac number, because 2105843391 - 2¹⁰ = 2105842367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105843291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116991291 + ... + 116991308.

It is an arithmetic number, because the mean of its divisors is an integer number (506962300).

Almost surely, 2^2105843391 is an apocalyptic number.

2105843391 is a deficient number, since it is larger than the sum of its proper divisors (935930409).

2105843391 is a wasteful number, since it uses less digits than its factorization.

2105843391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233982605 (or 233982602 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 2105843391 is about 45889.4692821785. The cubic root of 2105843391 is about 1281.7658308441.

The spelling of 2105843391 in words is "two billion, one hundred five million, eight hundred forty-three thousand, three hundred ninety-one".