22444561 has 2 divisors, whose sum is σ = 22444562. Its totient is φ = 22444560.

The previous prime is 22444547. The next prime is 22444577. The reversal of 22444561 is 16544422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 24336 = 4735^2 + 156^2 .

It is a cyclic number.

It is not a de Polignac number, because 22444561 - 2⁹ = 22444049 is a prime.

It is not a weakly prime, because it can be changed into another prime (22444661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11222280 + 11222281.

It is an arithmetic number, because the mean of its divisors is an integer number (11222281).

Almost surely, 2^22444561 is an apocalyptic number.

It is an amenable number.

22444561 is a deficient number, since it is larger than the sum of its proper divisors (1).

22444561 is an equidigital number, since it uses as much as digits as its factorization.

22444561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 28.

The square root of 22444561 is about 4737.5691023984. The cubic root of 22444561 is about 282.0787508713.

Adding to 22444561 its reverse (16544422), we get a palindrome (38988983).

It can be divided in two parts, 22444 and 561, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 22444561 in words is "twenty-two million, four hundred forty-four thousand, five hundred sixty-one".