9191000091000 has 256 divisors, whose sum is σ = 35293441397760. Its totient is φ = 1939199961600.

The previous prime is 9191000090999. The next prime is 9191000091011. The reversal of 9191000091000 is 1900001919.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16560334 + ... + 17106333.

It is an arithmetic number, because the mean of its divisors is an integer number (137865005460).

Almost surely, 2^{9191000091000} is an apocalyptic number.

It is an amenable number.

9191000091000 is an abundant number, since it is smaller than the sum of its proper divisors (26102441306760).

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

9191000091000 is a wasteful number, since it uses less digits than its factorization.

9191000091000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33666711 (or 33666697 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 30.

Adding to 9191000091000 its reverse (1900001919), we get a palindrome (9192900092919).

The spelling of 9191000091000 in words is "nine trillion, one hundred ninety-one billion, ninety-one thousand".