2105391959 has 4 divisors (see below), whose sum is σ = 2296791240. Its totient is φ = 1913992680.

The previous prime is 2105391947. The next prime is 2105391973. The reversal of 2105391959 is 9591935012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2105391959 - 2⁸ = 2105391703 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 (2105391989) 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 3 ways as a sum of consecutive naturals, for example, 95699624 + ... + 95699645.

It is an arithmetic number, because the mean of its divisors is an integer number (574197810).

Almost surely, 2^2105391959 is an apocalyptic number.

2105391959 is a deficient number, since it is larger than the sum of its proper divisors (191399281).

2105391959 is a wasteful number, since it uses less digits than its factorization.

2105391959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191399280.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 2105391959 is about 45884.5503301493. The cubic root of 2105391959 is about 1281.6742331075.

The spelling of 2105391959 in words is "two billion, one hundred five million, three hundred ninety-one thousand, nine hundred fifty-nine".