91000000900 has 72 divisors (see below), whose sum is σ = 203925559040. Its totient is φ = 35211024000.

The previous prime is 91000000891. The next prime is 91000000921. The reversal of 91000000900 is 900000019.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10005355 + ... + 10014445.

Almost surely, 2^91000000900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91000000900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101962779520).

91000000900 is an abundant number, since it is smaller than the sum of its proper divisors (112925558140).

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

91000000900 is a wasteful number, since it uses less digits than its factorization.

91000000900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12365 (or 12358 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 19.

Adding to 91000000900 its reverse (900000019), we get a palindrome (91900000919).

The spelling of 91000000900 in words is "ninety-one billion, nine hundred", and thus it is an aban number.