2171794915 has 4 divisors (see below), whose sum is σ = 2606153904. Its totient is φ = 1737435928.

The previous prime is 2171794909. The next prime is 2171794991. The reversal of 2171794915 is 5194971712.

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 2171794915 - 2⁷ = 2171794787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 217179487 + ... + 217179496.

It is an arithmetic number, because the mean of its divisors is an integer number (651538476).

Almost surely, 2^2171794915 is an apocalyptic number.

2171794915 is a deficient number, since it is larger than the sum of its proper divisors (434358989).

2171794915 is an equidigital number, since it uses as much as digits as its factorization.

2171794915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434358988.

The product of its digits is 158760, while the sum is 46.

The square root of 2171794915 is about 46602.5204790471. The cubic root of 2171794915 is about 1295.0094492038.

The spelling of 2171794915 in words is "two billion, one hundred seventy-one million, seven hundred ninety-four thousand, nine hundred fifteen".