91043810823 has 32 divisors (see below), whose sum is σ = 146252608000. Its totient is φ = 49213495296.

The previous prime is 91043810807. The next prime is 91043810827. The reversal of 91043810823 is 32801834019.

It is not a de Polignac number, because 91043810823 - 2⁴ = 91043810807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91043810827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99003 + ... + 438051.

It is an arithmetic number, because the mean of its divisors is an integer number (4570394000).

Almost surely, 2^91043810823 is an apocalyptic number.

91043810823 is a deficient number, since it is larger than the sum of its proper divisors (55208797177).

91043810823 is a wasteful number, since it uses less digits than its factorization.

91043810823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339751.

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 91043810823 in words is "ninety-one billion, forty-three million, eight hundred ten thousand, eight hundred twenty-three".