9191000091900 has 72 divisors (see below), whose sum is σ = 29010138482304. Its totient is φ = 2228121233600.

The previous prime is 9191000091857. The next prime is 9191000091907. The reversal of 9191000091900 is 91900001919.

It is a super-2 number, since 2×9191000091900² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9191000091907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1392572472 + ... + 1392579071.

It is an arithmetic number, because the mean of its divisors is an integer number (402918590032).

Almost surely, 2^{9191000091900} is an apocalyptic number.

It is an amenable number.

9191000091900 is an abundant number, since it is smaller than the sum of its proper divisors (19819138390404).

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

9191000091900 is a wasteful number, since it uses less digits than its factorization.

9191000091900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785151571 (or 2785151564 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 39.

The spelling of 9191000091900 in words is "nine trillion, one hundred ninety-one billion, ninety-one thousand, nine hundred".