91359823 has 4 divisors (see below), whose sum is σ = 91657720. Its totient is φ = 91061928.

The previous prime is 91359817. The next prime is 91359833. The reversal of 91359823 is 32895319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32895319 = 97 ⋅339127.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91359823 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 (91359803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148488 + ... + 149101.

It is an arithmetic number, because the mean of its divisors is an integer number (22914430).

Almost surely, 2^91359823 is an apocalyptic number.

91359823 is a deficient number, since it is larger than the sum of its proper divisors (297897).

91359823 is a wasteful number, since it uses less digits than its factorization.

91359823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297896.

The product of its digits is 58320, while the sum is 40.

The square root of 91359823 is about 9558.2332572500. The cubic root of 91359823 is about 450.3862083631.

The spelling of 91359823 in words is "ninety-one million, three hundred fifty-nine thousand, eight hundred twenty-three".