91000909100 has 36 divisors (see below), whose sum is σ = 199427162928. Its totient is φ = 36039960000.

The previous prime is 91000909091. The next prime is 91000909133. The reversal of 91000909100 is 190900019.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4494896 + ... + 4515095.

Almost surely, 2^91000909100 is an apocalyptic number.

It is an amenable number.

91000909100 is an abundant number, since it is smaller than the sum of its proper divisors (108426253828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91000909100 is a wasteful number, since it uses less digits than its factorization.

91000909100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010106 (or 9010099 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 29.

The spelling of 91000909100 in words is "ninety-one billion, nine hundred nine thousand, one hundred".