91923608893 has 4 divisors (see below), whose sum is σ = 95093388540. Its totient is φ = 88753829248.

The previous prime is 91923608879. The next prime is 91923608911. The reversal of 91923608893 is 39880632919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39880632919 = 39229 ⋅1016611.

It can be written as a sum of positive squares in 2 ways, for example, as 34105963684 + 57817645209 = 184678^2 + 240453^2 .

It is a cyclic number.

It is not a de Polignac number, because 91923608893 - 2¹³ = 91923600701 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 (91923608873) 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, 1584889780 + ... + 1584889837.

It is an arithmetic number, because the mean of its divisors is an integer number (23773347135).

Almost surely, 2^91923608893 is an apocalyptic number.

It is an amenable number.

91923608893 is a deficient number, since it is larger than the sum of its proper divisors (3169779647).

91923608893 is a wasteful number, since it uses less digits than its factorization.

91923608893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169779646.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 91923608893 in words is "ninety-one billion, nine hundred twenty-three million, six hundred eight thousand, eight hundred ninety-three".