91120919091 has 8 divisors (see below), whose sum is σ = 124778195664. Its totient is φ = 59105460960.

The previous prime is 91120919089. The next prime is 91120919119. The reversal of 91120919091 is 19091902119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91120919091 - 2¹ = 91120919089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91120919041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410454480 + ... + 410454701.

It is an arithmetic number, because the mean of its divisors is an integer number (15597274458).

Almost surely, 2^91120919091 is an apocalyptic number.

91120919091 is a deficient number, since it is larger than the sum of its proper divisors (33657276573).

91120919091 is a wasteful number, since it uses less digits than its factorization.

91120919091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820909221.

The product of its (nonzero) digits is 13122, while the sum is 42.

The spelling of 91120919091 in words is "ninety-one billion, one hundred twenty million, nine hundred nineteen thousand, ninety-one".