22811813 has 4 divisors (see below), whose sum is σ = 22827840. Its totient is φ = 22795788.

The previous prime is 22811809. The next prime is 22811827. The reversal of 22811813 is 31811822.

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 22811813 - 2² = 22811809 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 (22811413) 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 in 3 ways as a sum of consecutive naturals, for example, 5645 + ... + 8802.

It is an arithmetic number, because the mean of its divisors is an integer number (5706960).

Almost surely, 2^22811813 is an apocalyptic number.

It is an amenable number.

22811813 is a deficient number, since it is larger than the sum of its proper divisors (16027).

22811813 is a wasteful number, since it uses less digits than its factorization.

22811813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16026.

The product of its digits is 768, while the sum is 26.

The square root of 22811813 is about 4776.1713746473. The cubic root of 22811813 is about 283.6089514847.

Subtracting 22811813 from its reverse (31811822), we obtain a palindrome (9000009).

The spelling of 22811813 in words is "twenty-two million, eight hundred eleven thousand, eight hundred thirteen".