2089647921 has 4 divisors (see below), whose sum is σ = 2786197232. Its totient is φ = 1393098612.

The previous prime is 2089647919. The next prime is 2089647971. The reversal of 2089647921 is 1297469802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2089647921 - 2¹ = 2089647919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2089647971) 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 3 ways as a sum of consecutive naturals, for example, 348274651 + ... + 348274656.

It is an arithmetic number, because the mean of its divisors is an integer number (696549308).

Almost surely, 2^2089647921 is an apocalyptic number.

It is an amenable number.

2089647921 is a deficient number, since it is larger than the sum of its proper divisors (696549311).

2089647921 is an equidigital number, since it uses as much as digits as its factorization.

2089647921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696549310.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 2089647921 is about 45712.6669644203. Note that the first 3 decimals coincide. The cubic root of 2089647921 is about 1278.4714666220.

The spelling of 2089647921 in words is "two billion, eighty-nine million, six hundred forty-seven thousand, nine hundred twenty-one".