2143931209 has 8 divisors (see below), whose sum is σ = 2450655680. Its totient is φ = 1837318896.

The previous prime is 2143931173. The next prime is 2143931213. The reversal of 2143931209 is 9021393412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2143931209 - 2¹⁹ = 2143406921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143931609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17962 + ... + 67900.

It is an arithmetic number, because the mean of its divisors is an integer number (306331960).

Almost surely, 2^2143931209 is an apocalyptic number.

It is an amenable number.

2143931209 is a deficient number, since it is larger than the sum of its proper divisors (306724471).

2143931209 is an equidigital number, since it uses as much as digits as its factorization.

2143931209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56079.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 2143931209 is about 46302.6047755415. The cubic root of 2143931209 is about 1289.4473543666.

The spelling of 2143931209 in words is "two billion, one hundred forty-three million, nine hundred thirty-one thousand, two hundred nine".