9928809191 has 12 divisors (see below), whose sum is σ = 11696044320. Its totient is φ = 8402677920.

The previous prime is 9928809179. The next prime is 9928809197. The reversal of 9928809191 is 1919088299.

It is a de Polignac number, because none of the positive numbers 2^k-9928809191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9928809197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1278590 + ... + 1286331.

It is an arithmetic number, because the mean of its divisors is an integer number (974670360).

Almost surely, 2^9928809191 is an apocalyptic number.

9928809191 is a deficient number, since it is larger than the sum of its proper divisors (1767235129).

9928809191 is a wasteful number, since it uses less digits than its factorization.

9928809191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565014 (or 2565007 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 56.

The square root of 9928809191 is about 99643.4101734781. The cubic root of 9928809191 is about 2149.3099780269.

The spelling of 9928809191 in words is "nine billion, nine hundred twenty-eight million, eight hundred nine thousand, one hundred ninety-one".