91745547169 has 2 divisors, whose sum is σ = 91745547170. Its totient is φ = 91745547168.

The previous prime is 91745547139. The next prime is 91745547203. The reversal of 91745547169 is 96174554719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55460250000 + 36285297169 = 235500^2 + 190487^2 .

It is an emirp because it is prime and its reverse (96174554719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91745547169 - 2⁹ = 91745546657 is a prime.

It is a super-2 number, since 2×91745547169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91745547119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45872773584 + 45872773585.

It is an arithmetic number, because the mean of its divisors is an integer number (45872773585).

Almost surely, 2^91745547169 is an apocalyptic number.

It is an amenable number.

91745547169 is a deficient number, since it is larger than the sum of its proper divisors (1).

91745547169 is an equidigital number, since it uses as much as digits as its factorization.

91745547169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9525600, while the sum is 58.

The spelling of 91745547169 in words is "ninety-one billion, seven hundred forty-five million, five hundred forty-seven thousand, one hundred sixty-nine".