91812836535 has 64 divisors (see below), whose sum is σ = 171873681408. Its totient is φ = 40975691904.

The previous prime is 91812836527. The next prime is 91812836539. The reversal of 91812836535 is 53563821819.

It is a happy number.

It is not a de Polignac number, because 91812836535 - 2³ = 91812836527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91812836539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13374514 + ... + 13381376.

It is an arithmetic number, because the mean of its divisors is an integer number (2685526272).

Almost surely, 2^91812836535 is an apocalyptic number.

91812836535 is a deficient number, since it is larger than the sum of its proper divisors (80060844873).

91812836535 is a wasteful number, since it uses less digits than its factorization.

91812836535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9884.

The product of its digits is 1555200, while the sum is 51.

The spelling of 91812836535 in words is "ninety-one billion, eight hundred twelve million, eight hundred thirty-six thousand, five hundred thirty-five".