91911011011 has 4 divisors (see below), whose sum is σ = 91915309224. Its totient is φ = 91906712800.

The previous prime is 91911010993. The next prime is 91911011063. The reversal of 91911011011 is 11011011919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11011011919 = 6451 ⋅1706869.

It is a cyclic number.

It is not a de Polignac number, because 91911011011 - 2⁷ = 91911010883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91911011081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2116870 + ... + 2159851.

It is an arithmetic number, because the mean of its divisors is an integer number (22978827306).

Almost surely, 2^91911011011 is an apocalyptic number.

91911011011 is a deficient number, since it is larger than the sum of its proper divisors (4298213).

91911011011 is a wasteful number, since it uses less digits than its factorization.

91911011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4298212.

The product of its (nonzero) digits is 81, while the sum is 25.

The spelling of 91911011011 in words is "ninety-one billion, nine hundred eleven million, eleven thousand, eleven".