91909190910 has 64 divisors (see below), whose sum is σ = 227743488000. Its totient is φ = 23713722240.

The previous prime is 91909190869. The next prime is 91909190911. The reversal of 91909190910 is 1909190919.

It is a self number, because there is not a number n which added to its sum of digits gives 91909190910.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91909190911) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 8748841 + ... + 8759339.

It is an arithmetic number, because the mean of its divisors is an integer number (3558492000).

Almost surely, 2^91909190910 is an apocalyptic number.

91909190910 is an abundant number, since it is smaller than the sum of its proper divisors (135834297090).

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

91909190910 is a wasteful number, since it uses less digits than its factorization.

91909190910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19953.

The product of its (nonzero) digits is 59049, while the sum is 48.

The spelling of 91909190910 in words is "ninety-one billion, nine hundred nine million, one hundred ninety thousand, nine hundred ten".