91909595473 has 2 divisors, whose sum is σ = 91909595474. Its totient is φ = 91909595472.

The previous prime is 91909595471. The next prime is 91909595497. The reversal of 91909595473 is 37459590919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87294838849 + 4614756624 = 295457^2 + 67932^2 .

It is a cyclic number.

It is not a de Polignac number, because 91909595473 - 2¹ = 91909595471 is a prime.

Together with 91909595471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91909595471) 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, 45954797736 + 45954797737.

It is an arithmetic number, because the mean of its divisors is an integer number (45954797737).

Almost surely, 2^91909595473 is an apocalyptic number.

It is an amenable number.

91909595473 is a deficient number, since it is larger than the sum of its proper divisors (1).

91909595473 is an equidigital number, since it uses as much as digits as its factorization.

91909595473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13778100, while the sum is 61.

The spelling of 91909595473 in words is "ninety-one billion, nine hundred nine million, five hundred ninety-five thousand, four hundred seventy-three".