91016520171 has 4 divisors (see below), whose sum is σ = 121355360232. Its totient is φ = 60677680112.

The previous prime is 91016520103. The next prime is 91016520191. The reversal of 91016520171 is 17102561019.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91016520171 - 2¹³ = 91016511979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91016520191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15169420026 + ... + 15169420031.

It is an arithmetic number, because the mean of its divisors is an integer number (30338840058).

Almost surely, 2^91016520171 is an apocalyptic number.

91016520171 is a deficient number, since it is larger than the sum of its proper divisors (30338840061).

91016520171 is a wasteful number, since it uses less digits than its factorization.

91016520171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30338840060.

The product of its (nonzero) digits is 3780, while the sum is 33.

The spelling of 91016520171 in words is "ninety-one billion, sixteen million, five hundred twenty thousand, one hundred seventy-one".