91043326723 has 4 divisors (see below), whose sum is σ = 91551948840. Its totient is φ = 90534704608.

The previous prime is 91043326721. The next prime is 91043326729. The reversal of 91043326723 is 32762334019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32762334019 = 37 ⋅885468487.

It is a cyclic number.

It is not a de Polignac number, because 91043326723 - 2¹ = 91043326721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91043326721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254310790 + ... + 254311147.

It is an arithmetic number, because the mean of its divisors is an integer number (22887987210).

Almost surely, 2^91043326723 is an apocalyptic number.

91043326723 is a deficient number, since it is larger than the sum of its proper divisors (508622117).

91043326723 is a wasteful number, since it uses less digits than its factorization.

91043326723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508622116.

The product of its (nonzero) digits is 163296, while the sum is 40.

The spelling of 91043326723 in words is "ninety-one billion, forty-three million, three hundred twenty-six thousand, seven hundred twenty-three".