91144911544 has 8 divisors (see below), whose sum is σ = 170896709160. Its totient is φ = 45572455768.

The previous prime is 91144911527. The next prime is 91144911551. The reversal of 91144911544 is 44511944119.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 91144911544.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5696556964 + ... + 5696556979.

It is an arithmetic number, because the mean of its divisors is an integer number (21362088645).

Almost surely, 2^91144911544 is an apocalyptic number.

It is an amenable number.

91144911544 is a deficient number, since it is larger than the sum of its proper divisors (79751797616).

91144911544 is a wasteful number, since it uses less digits than its factorization.

91144911544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11393113949 (or 11393113945 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The spelling of 91144911544 in words is "ninety-one billion, one hundred forty-four million, nine hundred eleven thousand, five hundred forty-four".