91604333923 has 4 divisors (see below), whose sum is σ = 91607275600. Its totient is φ = 91601392248.

The previous prime is 91604333917. The next prime is 91604333939. The reversal of 91604333923 is 32933340619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32933340619 = 37 ⋅890090287.

It is a cyclic number.

It is not a de Polignac number, because 91604333923 - 2¹³ = 91604325731 is a prime.

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 91604333923.

It is not an unprimeable number, because it can be changed into a prime (91604333423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1423623 + ... + 1486576.

It is an arithmetic number, because the mean of its divisors is an integer number (22901818900).

Almost surely, 2^91604333923 is an apocalyptic number.

91604333923 is a deficient number, since it is larger than the sum of its proper divisors (2941677).

91604333923 is a wasteful number, since it uses less digits than its factorization.

91604333923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941676.

The product of its (nonzero) digits is 314928, while the sum is 43.

The spelling of 91604333923 in words is "ninety-one billion, six hundred four million, three hundred thirty-three thousand, nine hundred twenty-three".