91071608513 has 32 divisors (see below), whose sum is σ = 97242393600. Its totient is φ = 85166484480.

The previous prime is 91071608503. The next prime is 91071608533. The reversal of 91071608513 is 31580617019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91071608513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91071608503) 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 in 31 ways as a sum of consecutive naturals, for example, 29867813 + ... + 29870861.

It is an arithmetic number, because the mean of its divisors is an integer number (3038824800).

Almost surely, 2^91071608513 is an apocalyptic number.

It is an amenable number.

91071608513 is a deficient number, since it is larger than the sum of its proper divisors (6170785087).

91071608513 is a wasteful number, since it uses less digits than its factorization.

91071608513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3417.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 91071608513 in words is "ninety-one billion, seventy-one million, six hundred eight thousand, five hundred thirteen".