91748161 has 2 divisors, whose sum is σ = 91748162. Its totient is φ = 91748160.

The previous prime is 91748159. The next prime is 91748191. The reversal of 91748161 is 16184719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48385936 + 43362225 = 6956^2 + 6585^2 .

It is an emirp because it is prime and its reverse (16184719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91748161 - 2¹ = 91748159 is a prime.

Together with 91748159, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91748161.

It is not a weakly prime, because it can be changed into another prime (91748191) 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 as a sum of consecutive naturals, namely, 45874080 + 45874081.

It is an arithmetic number, because the mean of its divisors is an integer number (45874081).

Almost surely, 2^91748161 is an apocalyptic number.

It is an amenable number.

91748161 is a deficient number, since it is larger than the sum of its proper divisors (1).

91748161 is an equidigital number, since it uses as much as digits as its factorization.

91748161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 91748161 is about 9578.5260348344. The cubic root of 91748161 is about 451.0234499928.

The spelling of 91748161 in words is "ninety-one million, seven hundred forty-eight thousand, one hundred sixty-one".