91748729 has 2 divisors, whose sum is σ = 91748730. Its totient is φ = 91748728.

The previous prime is 91748707. The next prime is 91748753. The reversal of 91748729 is 92784719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 26543104 = 8075^2 + 5152^2 .

It is an emirp because it is prime and its reverse (92784719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91748729 - 2²⁰ = 90700153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91748029) 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, 45874364 + 45874365.

It is an arithmetic number, because the mean of its divisors is an integer number (45874365).

Almost surely, 2^91748729 is an apocalyptic number.

It is an amenable number.

91748729 is a deficient number, since it is larger than the sum of its proper divisors (1).

91748729 is an equidigital number, since it uses as much as digits as its factorization.

91748729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 91748729 is about 9578.5556844443. Note that the first 3 decimals coincide. The cubic root of 91748729 is about 451.0243807319.

The spelling of 91748729 in words is "ninety-one million, seven hundred forty-eight thousand, seven hundred twenty-nine".