91823 has 2 divisors, whose sum is σ = 91824. Its totient is φ = 91822.

The previous prime is 91813. The next prime is 91837. The reversal of 91823 is 32819.

It is a weak prime.

91823 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 91823 - 2⁴ = 91807 is a prime.

It is a d-powerful number, because it can be written as 9⁵ + 1 + 8⁵ + 2 + 3 .

It is a plaindrome in base 14 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45911 + 45912.

It is an arithmetic number, because the mean of its divisors is an integer number (45912).

2⁹¹⁸²³ is an apocalyptic number.

91823 is a deficient number, since it is larger than the sum of its proper divisors (1).

91823 is an equidigital number, since it uses as much as digits as its factorization.

91823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 91823 is about 303.0231014296. The cubic root of 91823 is about 45.1146049981.

The spelling of 91823 in words is "ninety-one thousand, eight hundred twenty-three".