99010000991 has 6 divisors (see below), whose sum is σ = 108829174776. Its totient is φ = 90009091700.

The previous prime is 99010000967. The next prime is 99010001023. The reversal of 99010000991 is 19900001099.

It is a happy number.

It is not a de Polignac number, because 99010000991 - 2¹⁰ = 99009999967 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 (99010000591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409132115 + ... + 409132356.

It is an arithmetic number, because the mean of its divisors is an integer number (18138195796).

Almost surely, 2^99010000991 is an apocalyptic number.

99010000991 is a deficient number, since it is larger than the sum of its proper divisors (9819173785).

99010000991 is a wasteful number, since it uses less digits than its factorization.

99010000991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818264493 (or 818264482 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 38.

The spelling of 99010000991 in words is "ninety-nine billion, ten million, nine hundred ninety-one", and thus it is an aban number.