22505447 has 2 divisors, whose sum is σ = 22505448. Its totient is φ = 22505446.

The previous prime is 22505429. The next prime is 22505453. The reversal of 22505447 is 74450522.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22505447 - 2²² = 18311143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22505047) 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 as a sum of consecutive naturals, namely, 11252723 + 11252724.

It is an arithmetic number, because the mean of its divisors is an integer number (11252724).

Almost surely, 2^22505447 is an apocalyptic number.

22505447 is a deficient number, since it is larger than the sum of its proper divisors (1).

22505447 is an equidigital number, since it uses as much as digits as its factorization.

22505447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 22505447 is about 4743.9906197209. The cubic root of 22505447 is about 282.3335882628. Note that the first 3 decimals are identical.

Adding to 22505447 its reverse (74450522), we get a palindrome (96955969).

The spelling of 22505447 in words is "twenty-two million, five hundred five thousand, four hundred forty-seven".