2159873809 has 4 divisors (see below), whose sum is σ = 2212553700. Its totient is φ = 2107193920.

The previous prime is 2159873791. The next prime is 2159873813. The reversal of 2159873809 is 9083789512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 525693184 + 1634180625 = 22928^2 + 40425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2159873809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159873839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26339884 + ... + 26339965.

It is an arithmetic number, because the mean of its divisors is an integer number (553138425).

Almost surely, 2^2159873809 is an apocalyptic number.

It is an amenable number.

2159873809 is a deficient number, since it is larger than the sum of its proper divisors (52679891).

2159873809 is an equidigital number, since it uses as much as digits as its factorization.

2159873809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52679890.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 2159873809 is about 46474.4425356561. The cubic root of 2159873809 is about 1292.6356403559.

The spelling of 2159873809 in words is "two billion, one hundred fifty-nine million, eight hundred seventy-three thousand, eight hundred nine".