91016435891 has 6 divisors (see below), whose sum is σ = 94047161076. Its totient is φ = 88080420900.

The previous prime is 91016435863. The next prime is 91016435899. The reversal of 91016435891 is 19853461019.

It is not a de Polignac number, because 91016435891 - 2³⁰ = 89942694067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91016435899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47354105 + ... + 47356026.

It is an arithmetic number, because the mean of its divisors is an integer number (15674526846).

Almost surely, 2^91016435891 is an apocalyptic number.

91016435891 is a deficient number, since it is larger than the sum of its proper divisors (3030725185).

91016435891 is an equidigital number, since it uses as much as digits as its factorization.

91016435891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94710193 (or 94710162 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 91016435891 in words is "ninety-one billion, sixteen million, four hundred thirty-five thousand, eight hundred ninety-one".