9100000091 has 16 divisors (see below), whose sum is σ = 11858825664. Its totient is φ = 6776469504.

The previous prime is 9100000079. The next prime is 9100000093. The reversal of 9100000091 is 1900000019.

9100000091 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-9100000091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9100000093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2939630 + ... + 2942723.

It is an arithmetic number, because the mean of its divisors is an integer number (741176604).

Almost surely, 2^9100000091 is an apocalyptic number.

9100000091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9100000091 is a deficient number, since it is larger than the sum of its proper divisors (2758825573).

9100000091 is a wasteful number, since it uses less digits than its factorization.

9100000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882390.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 9100000091 is about 95393.9206186642. The cubic root of 9100000091 is about 2087.7594856226.

It can be divided in two parts, 91000000 and 91, that multiplied together give a square (8281000000 = 91000²).

The spelling of 9100000091 in words is "nine billion, one hundred million, ninety-one", and thus it is an aban number.