91447271 has 2 divisors, whose sum is σ = 91447272. Its totient is φ = 91447270.

The previous prime is 91447253. The next prime is 91447337. The reversal of 91447271 is 17274419.

It is a weak prime.

It is an emirp because it is prime and its reverse (17274419) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91447271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91447201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45723635 + 45723636.

It is an arithmetic number, because the mean of its divisors is an integer number (45723636).

Almost surely, 2^91447271 is an apocalyptic number.

91447271 is a deficient number, since it is larger than the sum of its proper divisors (1).

91447271 is an equidigital number, since it uses as much as digits as its factorization.

91447271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 91447271 is about 9562.8066486780. The cubic root of 91447271 is about 450.5298630981.

The spelling of 91447271 in words is "ninety-one million, four hundred forty-seven thousand, two hundred seventy-one".