9911980209 has 32 divisors (see below), whose sum is σ = 14087773440. Its totient is φ = 6187104000.

The previous prime is 9911980187. The next prime is 9911980213. The reversal of 9911980209 is 9020891199.

It is not a de Polignac number, because 9911980209 - 2¹⁹ = 9911455921 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (9911980229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 996159 + ... + 1006059.

It is an arithmetic number, because the mean of its divisors is an integer number (440242920).

Almost surely, 2^9911980209 is an apocalyptic number.

It is an amenable number.

9911980209 is a deficient number, since it is larger than the sum of its proper divisors (4175793231).

9911980209 is a wasteful number, since it uses less digits than its factorization.

9911980209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10281.

The product of its (nonzero) digits is 104976, while the sum is 48.

The square root of 9911980209 is about 99558.9283238826. The cubic root of 9911980209 is about 2148.0949563822.

The spelling of 9911980209 in words is "nine billion, nine hundred eleven million, nine hundred eighty thousand, two hundred nine".