22015445 has 4 divisors (see below), whose sum is σ = 26418540. Its totient is φ = 17612352.

The previous prime is 22015417. The next prime is 22015447. The reversal of 22015445 is 54451022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54451022 = 2 ⋅27225511.

It can be written as a sum of positive squares in 2 ways, for example, as 6507601 + 15507844 = 2551^2 + 3938^2 .

It is a cyclic number.

It is not a de Polignac number, because 22015445 - 2¹⁸ = 21753301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22015445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22015447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2201540 + ... + 2201549.

It is an arithmetic number, because the mean of its divisors is an integer number (6604635).

Almost surely, 2^22015445 is an apocalyptic number.

It is an amenable number.

22015445 is a deficient number, since it is larger than the sum of its proper divisors (4403095).

22015445 is an equidigital number, since it uses as much as digits as its factorization.

22015445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403094.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 22015445 is about 4692.0619134875. The cubic root of 22015445 is about 280.2694896925.

Adding to 22015445 its reverse (54451022), we get a palindrome (76466467).

The spelling of 22015445 in words is "twenty-two million, fifteen thousand, four hundred forty-five".