91281384563 has 2 divisors, whose sum is σ = 91281384564. Its totient is φ = 91281384562.

The previous prime is 91281384533. The next prime is 91281384659. The reversal of 91281384563 is 36548318219.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91281384563 - 2¹² = 91281380467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (91281384533) 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, 45640692281 + 45640692282.

It is an arithmetic number, because the mean of its divisors is an integer number (45640692282).

Almost surely, 2^91281384563 is an apocalyptic number.

91281384563 is a deficient number, since it is larger than the sum of its proper divisors (1).

91281384563 is an equidigital number, since it uses as much as digits as its factorization.

91281384563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 50.

The spelling of 91281384563 in words is "ninety-one billion, two hundred eighty-one million, three hundred eighty-four thousand, five hundred sixty-three".