91819190911 has 12 divisors (see below), whose sum is σ = 108314450640. Its totient is φ = 77593679520.

The previous prime is 91819190899. The next prime is 91819190921. The reversal of 91819190911 is 11909191819.

It is not a de Polignac number, because 91819190911 - 2⁷ = 91819190783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91819190921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13192726 + ... + 13199683.

It is an arithmetic number, because the mean of its divisors is an integer number (9026204220).

Almost surely, 2^91819190911 is an apocalyptic number.

91819190911 is a deficient number, since it is larger than the sum of its proper divisors (16495259729).

91819190911 is a wasteful number, since it uses less digits than its factorization.

91819190911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26392494 (or 26392487 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 49.

The spelling of 91819190911 in words is "ninety-one billion, eight hundred nineteen million, one hundred ninety thousand, nine hundred eleven".