91856543 has 12 divisors (see below), whose sum is σ = 95740320. Its totient is φ = 88124736.

The previous prime is 91856537. The next prime is 91856551. The reversal of 91856543 is 34565819.

It is not a de Polignac number, because 91856543 - 2¹⁴ = 91840159 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91856543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91856143) 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, 200771 + ... + 201227.

It is an arithmetic number, because the mean of its divisors is an integer number (7978360).

Almost surely, 2^91856543 is an apocalyptic number.

91856543 is a deficient number, since it is larger than the sum of its proper divisors (3883777).

91856543 is a wasteful number, since it uses less digits than its factorization.

91856543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754 (or 725 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 91856543 is about 9584.1819160531. The cubic root of 91856543 is about 451.2009779390.

The spelling of 91856543 in words is "ninety-one million, eight hundred fifty-six thousand, five hundred forty-three".