91103621109 has 16 divisors (see below), whose sum is σ = 124629713472. Its totient is φ = 59164213248.

The previous prime is 91103621093. The next prime is 91103621131. The reversal of 91103621109 is 90112630119.

It is not a de Polignac number, because 91103621109 - 2⁴ = 91103621093 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91103621109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91103601109) by changing a digit.

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, 898572 + ... + 994805.

It is an arithmetic number, because the mean of its divisors is an integer number (7789357092).

Almost surely, 2^91103621109 is an apocalyptic number.

It is an amenable number.

91103621109 is a deficient number, since it is larger than the sum of its proper divisors (33526092363).

91103621109 is a wasteful number, since it uses less digits than its factorization.

91103621109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893796.

The product of its (nonzero) digits is 2916, while the sum is 33.

The spelling of 91103621109 in words is "ninety-one billion, one hundred three million, six hundred twenty-one thousand, one hundred nine".