91910091000 has 256 divisors, whose sum is σ = 352935797760. Its totient is φ = 19391961600.

The previous prime is 91910090977. The next prime is 91910091029. The reversal of 91910091000 is 19001919.

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 (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 104667 + ... + 441333.

It is an arithmetic number, because the mean of its divisors is an integer number (1378655460).

Almost surely, 2^91910091000 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 91910091000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176467898880).

91910091000 is an abundant number, since it is smaller than the sum of its proper divisors (261025706760).

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

91910091000 is a wasteful number, since it uses less digits than its factorization.

91910091000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336711 (or 336697 counting only the distinct ones).

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

Adding to 91910091000 its reverse (19001919), we get a palindrome (91929092919).

The spelling of 91910091000 in words is "ninety-one billion, nine hundred ten million, ninety-one thousand".