9909694091 has 4 divisors (see below), whose sum is σ = 10810575384. Its totient is φ = 9008812800.

The previous prime is 9909694087. The next prime is 9909694159. The reversal of 9909694091 is 1904969099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1904969099 = 11 ⋅173179009.

It is a cyclic number.

It is not a de Polignac number, because 9909694091 - 2² = 9909694087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9909694051) 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, 450440630 + ... + 450440651.

It is an arithmetic number, because the mean of its divisors is an integer number (2702643846).

Almost surely, 2^9909694091 is an apocalyptic number.

9909694091 is a deficient number, since it is larger than the sum of its proper divisors (900881293).

9909694091 is a wasteful number, since it uses less digits than its factorization.

9909694091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900881292.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The square root of 9909694091 is about 99547.4464313375. The cubic root of 9909694091 is about 2147.9297967796.

The spelling of 9909694091 in words is "nine billion, nine hundred nine million, six hundred ninety-four thousand, ninety-one".