99909991001 has 8 divisors (see below), whose sum is σ = 105233887680. Its totient is φ = 94592641968.

The previous prime is 99909990989. The next prime is 99909991007. The reversal of 99909991001 is 10019990999.

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 99909991001 - 2²⁶ = 99842882137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99909991007) 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 7 ways as a sum of consecutive naturals, for example, 1605566 + ... + 1666631.

It is an arithmetic number, because the mean of its divisors is an integer number (13154235960).

Almost surely, 2^99909991001 is an apocalyptic number.

It is an amenable number.

99909991001 is a deficient number, since it is larger than the sum of its proper divisors (5323896679).

99909991001 is a wasteful number, since it uses less digits than its factorization.

99909991001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273823.

The product of its (nonzero) digits is 531441, while the sum is 56.

The spelling of 99909991001 in words is "ninety-nine billion, nine hundred nine million, nine hundred ninety-one thousand, one".