9100000991 has 8 divisors (see below), whose sum is σ = 9498570624. Its totient is φ = 8701674520.

The previous prime is 9100000969. The next prime is 9100001011. The reversal of 9100000991 is 1990000019.

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 9100000991 - 2¹⁸ = 9099738847 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 (9100000951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17876 + ... + 136086.

It is an arithmetic number, because the mean of its divisors is an integer number (1187321328).

Almost surely, 2^9100000991 is an apocalyptic number.

9100000991 is a deficient number, since it is larger than the sum of its proper divisors (398569633).

9100000991 is a wasteful number, since it uses less digits than its factorization.

9100000991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121581.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 9100000991 is about 95393.9253359458. The cubic root of 9100000991 is about 2087.7595544499.

The spelling of 9100000991 in words is "nine billion, one hundred million, nine hundred ninety-one", and thus it is an aban number.