22544813 has 4 divisors (see below), whose sum is σ = 22561920. Its totient is φ = 22527708.

The previous prime is 22544801. The next prime is 22544831. The reversal of 22544813 is 31844522.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31844522 = 2 ⋅15922261.

It is a cyclic number.

It is not a de Polignac number, because 22544813 - 2¹² = 22540717 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 (22544213) 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, 6395 + ... + 9272.

It is an arithmetic number, because the mean of its divisors is an integer number (5640480).

Almost surely, 2^22544813 is an apocalyptic number.

It is an amenable number.

22544813 is a deficient number, since it is larger than the sum of its proper divisors (17107).

22544813 is a wasteful number, since it uses less digits than its factorization.

22544813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17106.

The product of its digits is 7680, while the sum is 29.

The square root of 22544813 is about 4748.1378455138. The cubic root of 22544813 is about 282.4981094713.

The spelling of 22544813 in words is "twenty-two million, five hundred forty-four thousand, eight hundred thirteen".