91345840441 has 2 divisors, whose sum is σ = 91345840442. Its totient is φ = 91345840440.

The previous prime is 91345840433. The next prime is 91345840499. The reversal of 91345840441 is 14404854319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66007886400 + 25337954041 = 256920^2 + 159179^2 .

It is a cyclic number.

It is not a de Polignac number, because 91345840441 - 2³ = 91345840433 is a prime.

It is not a weakly prime, because it can be changed into another prime (91345840741) 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, 45672920220 + 45672920221.

It is an arithmetic number, because the mean of its divisors is an integer number (45672920221).

Almost surely, 2^91345840441 is an apocalyptic number.

It is an amenable number.

91345840441 is a deficient number, since it is larger than the sum of its proper divisors (1).

91345840441 is an equidigital number, since it uses as much as digits as its factorization.

91345840441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 91345840441 in words is "ninety-one billion, three hundred forty-five million, eight hundred forty thousand, four hundred forty-one".