91871802227 has 4 divisors (see below), whose sum is σ = 92185358160. Its totient is φ = 91558246296.

The previous prime is 91871802221. The next prime is 91871802229. The reversal of 91871802227 is 72220817819.

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 91871802227 - 2³² = 87576834931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91871802221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156777527 + ... + 156778112.

It is an arithmetic number, because the mean of its divisors is an integer number (23046339540).

Almost surely, 2^91871802227 is an apocalyptic number.

91871802227 is a deficient number, since it is larger than the sum of its proper divisors (313555933).

91871802227 is a wasteful number, since it uses less digits than its factorization.

91871802227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313555932.

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 91871802227 in words is "ninety-one billion, eight hundred seventy-one million, eight hundred two thousand, two hundred twenty-seven".