91873228171 has 2 divisors, whose sum is σ = 91873228172. Its totient is φ = 91873228170.

The previous prime is 91873228169. The next prime is 91873228193. The reversal of 91873228171 is 17182237819.

It is a weak prime.

It is an emirp because it is prime and its reverse (17182237819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91873228171 - 2¹ = 91873228169 is a prime.

Together with 91873228169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91873228141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45936614085 + 45936614086.

It is an arithmetic number, because the mean of its divisors is an integer number (45936614086).

Almost surely, 2^91873228171 is an apocalyptic number.

91873228171 is a deficient number, since it is larger than the sum of its proper divisors (1).

91873228171 is an equidigital number, since it uses as much as digits as its factorization.

91873228171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 49.

The spelling of 91873228171 in words is "ninety-one billion, eight hundred seventy-three million, two hundred twenty-eight thousand, one hundred seventy-one".