91520076509 has 2 divisors, whose sum is σ = 91520076510. Its totient is φ = 91520076508.

The previous prime is 91520076491. The next prime is 91520076517. The reversal of 91520076509 is 90567002519.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72086880100 + 19433196409 = 268490^2 + 139403^2 .

It is a cyclic number.

It is not a de Polignac number, because 91520076509 - 2¹⁶ = 91520010973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91520076509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91520076559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45760038254 + 45760038255.

It is an arithmetic number, because the mean of its divisors is an integer number (45760038255).

Almost surely, 2^91520076509 is an apocalyptic number.

It is an amenable number.

91520076509 is a deficient number, since it is larger than the sum of its proper divisors (1).

91520076509 is an equidigital number, since it uses as much as digits as its factorization.

91520076509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 91520076509 in words is "ninety-one billion, five hundred twenty million, seventy-six thousand, five hundred nine".