101823 has 4 divisors (see below), whose sum is σ = 135768. Its totient is φ = 67880.

The previous prime is 101807. The next prime is 101833. The reversal of 101823 is 328101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328101 = 3 ⋅109367.

It is a cyclic number.

It is not a de Polignac number, because 101823 - 2⁴ = 101807 is a prime.

It is a D-number.

101823 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101833) 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, 16968 + ... + 16973.

It is an arithmetic number, because the mean of its divisors is an integer number (33942).

2¹⁰¹⁸²³ is an apocalyptic number.

101823 is a deficient number, since it is larger than the sum of its proper divisors (33945).

101823 is an equidigital number, since it uses as much as digits as its factorization.

101823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33944.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 101823 is about 319.0971638859. The cubic root of 101823 is about 46.6962454205.

Adding to 101823 its reverse (328101), we get a palindrome (429924).

The spelling of 101823 in words is "one hundred one thousand, eight hundred twenty-three".