22813 has 4 divisors (see below), whose sum is σ = 26080. Its totient is φ = 19548.

The previous prime is 22811. The next prime is 22817. The reversal of 22813 is 31822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22813 - 2¹ = 22811 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 (22811) 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, 1623 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (6520).

2²²⁸¹³ is an apocalyptic number.

It is an amenable number.

22813 is a deficient number, since it is larger than the sum of its proper divisors (3267).

22813 is an equidigital number, since it uses as much as digits as its factorization.

22813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266.

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

The square root of 22813 is about 151.0397298726. The cubic root of 22813 is about 28.3613870544.

Subtracting 22813 from its reverse (31822), we obtain a palindrome (9009).

The spelling of 22813 in words is "twenty-two thousand, eight hundred thirteen".