91681171 has 2 divisors, whose sum is σ = 91681172. Its totient is φ = 91681170.

The previous prime is 91681169. The next prime is 91681181. The reversal of 91681171 is 17118619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91681171 - 2¹ = 91681169 is a prime.

Together with 91681169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91681111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45840585 + 45840586.

It is an arithmetic number, because the mean of its divisors is an integer number (45840586).

Almost surely, 2^91681171 is an apocalyptic number.

91681171 is a deficient number, since it is larger than the sum of its proper divisors (1).

91681171 is an equidigital number, since it uses as much as digits as its factorization.

91681171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 34.

The square root of 91681171 is about 9575.0285117069. The cubic root of 91681171 is about 450.9136515432.

The spelling of 91681171 in words is "ninety-one million, six hundred eighty-one thousand, one hundred seventy-one".