91320751208 has 8 divisors (see below), whose sum is σ = 171226408530. Its totient is φ = 45660375600.

The previous prime is 91320751199. The next prime is 91320751219. The reversal of 91320751208 is 80215702319.

It can be written as a sum of positive squares in only one way, i.e., 69399579844 + 21921171364 = 263438^2 + 148058^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5707546943 + ... + 5707546958.

Almost surely, 2^91320751208 is an apocalyptic number.

It is an amenable number.

91320751208 is a deficient number, since it is larger than the sum of its proper divisors (79905657322).

91320751208 is a wasteful number, since it uses less digits than its factorization.

91320751208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11415093907 (or 11415093903 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 91320751208 in words is "ninety-one billion, three hundred twenty million, seven hundred fifty-one thousand, two hundred eight".