22144561 has 4 divisors (see below), whose sum is σ = 23107392. Its totient is φ = 21181732.

The previous prime is 22144559. The next prime is 22144589. The reversal of 22144561 is 16544122.

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 22144561 - 2¹ = 22144559 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (22144511) 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, 481381 + ... + 481426.

It is an arithmetic number, because the mean of its divisors is an integer number (5776848).

Almost surely, 2^22144561 is an apocalyptic number.

It is an amenable number.

22144561 is a deficient number, since it is larger than the sum of its proper divisors (962831).

22144561 is an equidigital number, since it uses as much as digits as its factorization.

22144561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962830.

The product of its digits is 1920, while the sum is 25.

The square root of 22144561 is about 4705.8007820136. The cubic root of 22144561 is about 280.8163294441.

Adding to 22144561 its reverse (16544122), we get a palindrome (38688683).

The spelling of 22144561 in words is "twenty-two million, one hundred forty-four thousand, five hundred sixty-one".