1009100000091 has 4 divisors (see below), whose sum is σ = 1345466666792. Its totient is φ = 672733333392.

The previous prime is 1009100000059. The next prime is 1009100000093. The reversal of 1009100000091 is 1900000019001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1009100000091 - 2⁵ = 1009100000059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009100000093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168183333346 + ... + 168183333351.

It is an arithmetic number, because the mean of its divisors is an integer number (336366666698).

Almost surely, 2^{1009100000091} is an apocalyptic number.

1009100000091 is a deficient number, since it is larger than the sum of its proper divisors (336366666701).

1009100000091 is an equidigital number, since it uses as much as digits as its factorization.

1009100000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336366666700.

The product of its (nonzero) digits is 81, while the sum is 21.

Adding to 1009100000091 its reverse (1900000019001), we get a palindrome (2909100019092).

The spelling of 1009100000091 in words is "one trillion, nine billion, one hundred million, ninety-one", and thus it is an aban number.