91834872579 has 20 divisors (see below), whose sum is σ = 137321510920. Its totient is φ = 61162516800.

The previous prime is 91834872557. The next prime is 91834872587. The reversal of 91834872579 is 97527843819.

91834872579 is a `hidden beast` number, since 9 + 1 + 83 + 487 + 2 + 5 + 79 = 666.

It is not a de Polignac number, because 91834872579 - 2⁸ = 91834872323 is a prime.

It is a super-2 number, since 2×91834872579² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91834872529) 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 19 ways as a sum of consecutive naturals, for example, 480097 + ... + 643554.

It is an arithmetic number, because the mean of its divisors is an integer number (6866075546).

Almost surely, 2^91834872579 is an apocalyptic number.

91834872579 is a deficient number, since it is larger than the sum of its proper divisors (45486638341).

91834872579 is a wasteful number, since it uses less digits than its factorization.

91834872579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124672 (or 1124663 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 91834872579 in words is "ninety-one billion, eight hundred thirty-four million, eight hundred seventy-two thousand, five hundred seventy-nine".