23811 has 4 divisors (see below), whose sum is σ = 31752. Its totient is φ = 15872.

The previous prime is 23801. The next prime is 23813. The reversal of 23811 is 11832.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23811 - 2⁶ = 23747 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (23813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3966 + ... + 3971.

It is an arithmetic number, because the mean of its divisors is an integer number (7938).

2²³⁸¹¹ is an apocalyptic number.

23811 is a deficient number, since it is larger than the sum of its proper divisors (7941).

23811 is an equidigital number, since it uses as much as digits as its factorization.

23811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7940.

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

The square root of 23811 is about 154.3081332918. The cubic root of 23811 is about 28.7690736695.

The spelling of 23811 in words is "twenty-three thousand, eight hundred eleven".