9911980217 has 4 divisors (see below), whose sum is σ = 9918869760. Its totient is φ = 9905090676.

The previous prime is 9911980213. The next prime is 9911980229. The reversal of 9911980217 is 7120891199.

9911980217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 9911980217 - 2² = 9911980213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9911980213) by changing a digit.

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, 3442613 + ... + 3445490.

It is an arithmetic number, because the mean of its divisors is an integer number (2479717440).

Almost surely, 2^9911980217 is an apocalyptic number.

It is an amenable number.

9911980217 is a deficient number, since it is larger than the sum of its proper divisors (6889543).

9911980217 is a wasteful number, since it uses less digits than its factorization.

9911980217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6889542.

The product of its (nonzero) digits is 81648, while the sum is 47.

The square root of 9911980217 is about 99558.9283640598. The cubic root of 9911980217 is about 2148.0949569601.

The spelling of 9911980217 in words is "nine billion, nine hundred eleven million, nine hundred eighty thousand, two hundred seventeen".