91000000100 has 36 divisors (see below), whose sum is σ = 199425170868. Its totient is φ = 36039600000.

The previous prime is 91000000099. The next prime is 91000000103. The reversal of 91000000100 is 100000019.

It can be written as a sum of positive squares in 6 ways, for example, as 8861586496 + 82138413604 = 94136^2 + 286598^2 .

It is not an unprimeable number, because it can be changed into a prime (91000000103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4494851 + ... + 4515050.

Almost surely, 2^91000000100 is an apocalyptic number.

It is an amenable number.

91000000100 is an abundant number, since it is smaller than the sum of its proper divisors (108425170768).

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

91000000100 is a wasteful number, since it uses less digits than its factorization.

91000000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9010016 (or 9010009 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 11.

Adding to 91000000100 its reverse (100000019), we get a palindrome (91100000119).

The spelling of 91000000100 in words is "ninety-one billion, one hundred", and thus it is an aban number.