91769456509 has 2 divisors, whose sum is σ = 91769456510. Its totient is φ = 91769456508.

The previous prime is 91769456461. The next prime is 91769456591. The reversal of 91769456509 is 90565496719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62927227609 + 28842228900 = 250853^2 + 169830^2 .

It is a cyclic number.

It is not a de Polignac number, because 91769456509 - 2⁹ = 91769455997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91769456599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45884728254 + 45884728255.

It is an arithmetic number, because the mean of its divisors is an integer number (45884728255).

Almost surely, 2^91769456509 is an apocalyptic number.

It is an amenable number.

91769456509 is a deficient number, since it is larger than the sum of its proper divisors (1).

91769456509 is an equidigital number, since it uses as much as digits as its factorization.

91769456509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18370800, while the sum is 61.

The spelling of 91769456509 in words is "ninety-one billion, seven hundred sixty-nine million, four hundred fifty-six thousand, five hundred nine".