91026765073 has 2 divisors, whose sum is σ = 91026765074. Its totient is φ = 91026765072.

The previous prime is 91026765031. The next prime is 91026765113. The reversal of 91026765073 is 37056762019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65368171584 + 25658593489 = 255672^2 + 160183^2 .

It is an emirp because it is prime and its reverse (37056762019) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91026765073 is a prime.

It is not a weakly prime, because it can be changed into another prime (91026765173) 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, 45513382536 + 45513382537.

It is an arithmetic number, because the mean of its divisors is an integer number (45513382537).

Almost surely, 2^91026765073 is an apocalyptic number.

It is an amenable number.

91026765073 is a deficient number, since it is larger than the sum of its proper divisors (1).

91026765073 is an equidigital number, since it uses as much as digits as its factorization.

91026765073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 46.

The spelling of 91026765073 in words is "ninety-one billion, twenty-six million, seven hundred sixty-five thousand, seventy-three".