91724068513 has 24 divisors (see below), whose sum is σ = 115820843264. Its totient is φ = 71102845440.

The previous prime is 91724068487. The next prime is 91724068529. The reversal of 91724068513 is 31586042719.

It is not a de Polignac number, because 91724068513 - 2²⁹ = 91187197601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91724068913) 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 in 23 ways as a sum of consecutive naturals, for example, 117081 + ... + 444022.

It is a 1-persistent number, because it is pandigital, but 2⋅91724068513 = 183448137026 is not.

Almost surely, 2^91724068513 is an apocalyptic number.

It is an amenable number.

91724068513 is a deficient number, since it is larger than the sum of its proper divisors (24096774751).

91724068513 is a wasteful number, since it uses less digits than its factorization.

91724068513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561325 (or 561314 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 91724068513 in words is "ninety-one billion, seven hundred twenty-four million, sixty-eight thousand, five hundred thirteen".