91983617974481 has 2 divisors, whose sum is σ = 91983617974482. Its totient is φ = 91983617974480.

The previous prime is 91983617974471. The next prime is 91983617974541. The reversal of 91983617974481 is 18447971638919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46110088974481 + 45873529000000 = 6790441^2 + 6773000^2 .

It is an emirp because it is prime and its reverse (18447971638919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91983617974481 - 2¹⁴ = 91983617958097 is a prime.

It is a super-2 number, since 2×91983617974481² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91983617974421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45991808987240 + 45991808987241.

It is an arithmetic number, because the mean of its divisors is an integer number (45991808987241).

Almost surely, 2^{91983617974481} is an apocalyptic number.

It is an amenable number.

91983617974481 is a deficient number, since it is larger than the sum of its proper divisors (1).

91983617974481 is an equidigital number, since it uses as much as digits as its factorization.

91983617974481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658409472, while the sum is 77.

The spelling of 91983617974481 in words is "ninety-one trillion, nine hundred eighty-three billion, six hundred seventeen million, nine hundred seventy-four thousand, four hundred eighty-one".