91016435889 has 64 divisors (see below), whose sum is σ = 150318950400. Its totient is φ = 54163619136.

The previous prime is 91016435863. The next prime is 91016435899. The reversal of 91016435889 is 98853461019.

91016435889 is a `hidden beast` number, since 9 + 1 + 0 + 16 + 43 + 588 + 9 = 666.

It is not a de Polignac number, because 91016435889 - 2⁷ = 91016435761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91016435819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 732967 + ... + 848099.

It is an arithmetic number, because the mean of its divisors is an integer number (2348733600).

Almost surely, 2^91016435889 is an apocalyptic number.

It is an amenable number.

91016435889 is a deficient number, since it is larger than the sum of its proper divisors (59302514511).

91016435889 is a wasteful number, since it uses less digits than its factorization.

91016435889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115251 (or 115245 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 91016435889 in words is "ninety-one billion, sixteen million, four hundred thirty-five thousand, eight hundred eighty-nine".