201823 has 2 divisors, whose sum is σ = 201824. Its totient is φ = 201822.

The previous prime is 201821. The next prime is 201827. The reversal of 201823 is 328102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201823 - 2¹ = 201821 is a prime.

Together with 201821, it forms a pair of twin primes.

201823 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 201797 and 201806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100911 + 100912.

It is an arithmetic number, because the mean of its divisors is an integer number (100912).

2²⁰¹⁸²³ is an apocalyptic number.

201823 is a deficient number, since it is larger than the sum of its proper divisors (1).

201823 is an equidigital number, since it uses as much as digits as its factorization.

201823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 201823 is about 449.2471480154. The cubic root of 201823 is about 58.6575004332.

Adding to 201823 its reverse (328102), we get a palindrome (529925).

It can be divided in two parts, 201 and 823, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 201823 in words is "two hundred one thousand, eight hundred twenty-three".