91330647993 has 12 divisors (see below), whose sum is σ = 142069897060. Its totient is φ = 56203475616.

The previous prime is 91330647983. The next prime is 91330648001. The reversal of 91330647993 is 39974603319.

It can be written as a sum of positive squares in 2 ways, for example, as 4548558249 + 86782089744 = 67443^2 + 294588^2 .

It is not a de Polignac number, because 91330647993 - 2²⁴ = 91313870777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91330647913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390301798 + ... + 390302031.

Almost surely, 2^91330647993 is an apocalyptic number.

It is an amenable number.

91330647993 is a deficient number, since it is larger than the sum of its proper divisors (50739249067).

91330647993 is a wasteful number, since it uses less digits than its factorization.

91330647993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780603848 (or 780603845 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 54.

The spelling of 91330647993 in words is "ninety-one billion, three hundred thirty million, six hundred forty-seven thousand, nine hundred ninety-three".