91684391211 has 128 divisors (see below), whose sum is σ = 166804531200. Its totient is φ = 48581406720.

The previous prime is 91684391189. The next prime is 91684391261. The reversal of 91684391211 is 11219348619.

91684391211 is a `hidden beast` number, since 91 + 6 + 8 + 439 + 121 + 1 = 666.

It is not a de Polignac number, because 91684391211 - 2⁶ = 91684391147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91684391261) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 140404561 + ... + 140405213.

It is an arithmetic number, because the mean of its divisors is an integer number (1303160400).

Almost surely, 2^91684391211 is an apocalyptic number.

91684391211 is a deficient number, since it is larger than the sum of its proper divisors (75120139989).

91684391211 is a wasteful number, since it uses less digits than its factorization.

91684391211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1260 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The spelling of 91684391211 in words is "ninety-one billion, six hundred eighty-four million, three hundred ninety-one thousand, two hundred eleven".