91474005841909 has 2 divisors, whose sum is σ = 91474005841910. Its totient is φ = 91474005841908.

The previous prime is 91474005841891. The next prime is 91474005841949. The reversal of 91474005841909 is 90914850047419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46145052790225 + 45328953051684 = 6793015^2 + 6732678^2 .

It is an emirp because it is prime and its reverse (90914850047419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91474005841909 - 2⁷ = 91474005841781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91474005841949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45737002920954 + 45737002920955.

It is an arithmetic number, because the mean of its divisors is an integer number (45737002920955).

Almost surely, 2^{91474005841909} is an apocalyptic number.

It is an amenable number.

91474005841909 is a deficient number, since it is larger than the sum of its proper divisors (1).

91474005841909 is an equidigital number, since it uses as much as digits as its factorization.

91474005841909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 91474005841909 in words is "ninety-one trillion, four hundred seventy-four billion, five million, eight hundred forty-one thousand, nine hundred nine".