10000443209 has 4 divisors (see below), whose sum is σ = 10244356500. Its totient is φ = 9756529920.

The previous prime is 10000443203. The next prime is 10000443247. The reversal of 10000443209 is 90234400001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90234400001 = 101 ⋅893409901.

It can be written as a sum of positive squares in 2 ways, for example, as 605406025 + 9395037184 = 24605^2 + 96928^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000443209 - 2⁸ = 10000442953 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 (10000443203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121956584 + ... + 121956665.

It is an arithmetic number, because the mean of its divisors is an integer number (2561089125).

Almost surely, 2^10000443209 is an apocalyptic number.

It is an amenable number.

10000443209 is a deficient number, since it is larger than the sum of its proper divisors (243913291).

10000443209 is an equidigital number, since it uses as much as digits as its factorization.

10000443209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243913290.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 10000443209 in words is "ten billion, four hundred forty-three thousand, two hundred nine".