9009099991 has 8 divisors (see below), whose sum is σ = 9079335440. Its totient is φ = 8938942272.

The previous prime is 9009099961. The next prime is 9009099997. The reversal of 9009099991 is 1999909009.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9009099991 - 2¹³ = 9009091799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9009099997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225181 + ... + 262153.

It is an arithmetic number, because the mean of its divisors is an integer number (1134916930).

Almost surely, 2^9009099991 is an apocalyptic number.

9009099991 is a deficient number, since it is larger than the sum of its proper divisors (70235449).

9009099991 is a wasteful number, since it uses less digits than its factorization.

9009099991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38865.

The product of its (nonzero) digits is 531441, while the sum is 55.

The square root of 9009099991 is about 94916.2788514173. The cubic root of 9009099991 is about 2080.7846514952.

The spelling of 9009099991 in words is "nine billion, nine million, ninety-nine thousand, nine hundred ninety-one".