91101920191 has 8 divisors (see below), whose sum is σ = 91536228000. Its totient is φ = 90667930080.

The previous prime is 91101920071. The next prime is 91101920207. The reversal of 91101920191 is 19102910119.

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 91101920191 - 2⁹ = 91101919679 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 (91101920491) 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, 505686 + ... + 661756.

It is an arithmetic number, because the mean of its divisors is an integer number (11442028500).

Almost surely, 2^91101920191 is an apocalyptic number.

91101920191 is a deficient number, since it is larger than the sum of its proper divisors (434307809).

91101920191 is a wasteful number, since it uses less digits than its factorization.

91101920191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158849.

The product of its (nonzero) digits is 1458, while the sum is 34.

The spelling of 91101920191 in words is "ninety-one billion, one hundred one million, nine hundred twenty thousand, one hundred ninety-one".