91143549920815 has 16 divisors (see below), whose sum is σ = 124999099541568. Its totient is φ = 62497318692096.

The previous prime is 91143549920809. The next prime is 91143549920879. The reversal of 91143549920815 is 51802994534119.

It is a cyclic number.

It is not a de Polignac number, because 91143549920815 - 2³⁵ = 91109190182447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21249102 + ... + 25175611.

It is an arithmetic number, because the mean of its divisors is an integer number (7812443721348).

Almost surely, 2^{91143549920815} is an apocalyptic number.

91143549920815 is a deficient number, since it is larger than the sum of its proper divisors (33855549620753).

91143549920815 is a wasteful number, since it uses less digits than its factorization.

91143549920815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46480818.

The product of its (nonzero) digits is 13996800, while the sum is 61.

The spelling of 91143549920815 in words is "ninety-one trillion, one hundred forty-three billion, five hundred forty-nine million, nine hundred twenty thousand, eight hundred fifteen".