91920011091 has 8 divisors (see below), whose sum is σ = 122930288064. Its totient is φ = 61094870760.

The previous prime is 91920011087. The next prime is 91920011147. The reversal of 91920011091 is 19011002919.

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

It is not a de Polignac number, because 91920011091 - 2² = 91920011087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91920011191) 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, 46283001 + ... + 46284986.

It is an arithmetic number, because the mean of its divisors is an integer number (15366286008).

Almost surely, 2^91920011091 is an apocalyptic number.

91920011091 is a deficient number, since it is larger than the sum of its proper divisors (31010276973).

91920011091 is a wasteful number, since it uses less digits than its factorization.

91920011091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92568321.

The product of its (nonzero) digits is 1458, while the sum is 33.

The spelling of 91920011091 in words is "ninety-one billion, nine hundred twenty million, eleven thousand, ninety-one".