91921920111 has 48 divisors (see below), whose sum is σ = 153875804160. Its totient is φ = 51790752000.

The previous prime is 91921920089. The next prime is 91921920127. The reversal of 91921920111 is 11102912919.

It is not a de Polignac number, because 91921920111 - 2⁷ = 91921919983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91921920131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3725431 + ... + 3750023.

It is an arithmetic number, because the mean of its divisors is an integer number (3205745920).

Almost surely, 2^91921920111 is an apocalyptic number.

91921920111 is a deficient number, since it is larger than the sum of its proper divisors (61953884049).

91921920111 is a wasteful number, since it uses less digits than its factorization.

91921920111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25436 (or 25433 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 91921920111 in words is "ninety-one billion, nine hundred twenty-one million, nine hundred twenty thousand, one hundred eleven".