9999214091 has 4 divisors (see below), whose sum is σ = 10006901184. Its totient is φ = 9991527000.

The previous prime is 9999214087. The next prime is 9999214117. The reversal of 9999214091 is 1904129999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9999214091 - 2² = 9999214087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999214391) 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, 3841595 + ... + 3844196.

It is an arithmetic number, because the mean of its divisors is an integer number (2501725296).

Almost surely, 2^9999214091 is an apocalyptic number.

9999214091 is a deficient number, since it is larger than the sum of its proper divisors (7687093).

9999214091 is a wasteful number, since it uses less digits than its factorization.

9999214091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7687092.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 9999214091 is about 99996.0703777903. The cubic root of 9999214091 is about 2154.3782488995.

The spelling of 9999214091 in words is "nine billion, nine hundred ninety-nine million, two hundred fourteen thousand, ninety-one".