22551205 has 4 divisors (see below), whose sum is σ = 27061452. Its totient is φ = 18040960.

The previous prime is 22551203. The next prime is 22551209. The reversal of 22551205 is 50215522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13205956 + 9345249 = 3634^2 + 3057^2 .

It is not a de Polignac number, because 22551205 - 2¹ = 22551203 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22551203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255116 + ... + 2255125.

It is an arithmetic number, because the mean of its divisors is an integer number (6765363).

Almost surely, 2^22551205 is an apocalyptic number.

It is an amenable number.

22551205 is a deficient number, since it is larger than the sum of its proper divisors (4510247).

22551205 is an equidigital number, since it uses as much as digits as its factorization.

22551205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510246.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 22551205 is about 4748.8109037948. The cubic root of 22551205 is about 282.5248052983.

Adding to 22551205 its reverse (50215522), we get a palindrome (72766727).

The spelling of 22551205 in words is "twenty-two million, five hundred fifty-one thousand, two hundred five".