91103621108 has 6 divisors (see below), whose sum is σ = 159431336946. Its totient is φ = 45551810552.

The previous prime is 91103621093. The next prime is 91103621131. The reversal of 91103621108 is 80112630119.

It can be written as a sum of positive squares in only one way, i.e., 89336427664 + 1767193444 = 298892^2 + 42038^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11387952635 + ... + 11387952642.

It is an arithmetic number, because the mean of its divisors is an integer number (26571889491).

Almost surely, 2^91103621108 is an apocalyptic number.

It is an amenable number.

91103621108 is a deficient number, since it is larger than the sum of its proper divisors (68327715838).

91103621108 is a wasteful number, since it uses less digits than its factorization.

91103621108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22775905281 (or 22775905279 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 91103621108 in words is "ninety-one billion, one hundred three million, six hundred twenty-one thousand, one hundred eight".