91183728313 has 4 divisors (see below), whose sum is σ = 91358745588. Its totient is φ = 91008711040.

The previous prime is 91183728301. The next prime is 91183728341. The reversal of 91183728313 is 31382738119.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62178913449 + 29004814864 = 249357^2 + 170308^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91183728313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91183728353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87507856 + ... + 87508897.

It is an arithmetic number, because the mean of its divisors is an integer number (22839686397).

Almost surely, 2^91183728313 is an apocalyptic number.

It is an amenable number.

91183728313 is a deficient number, since it is larger than the sum of its proper divisors (175017275).

91183728313 is a wasteful number, since it uses less digits than its factorization.

91183728313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175017274.

The product of its digits is 217728, while the sum is 46.

The spelling of 91183728313 in words is "ninety-one billion, one hundred eighty-three million, seven hundred twenty-eight thousand, three hundred thirteen".