22205551 has 4 divisors (see below), whose sum is σ = 22257504. Its totient is φ = 22153600.

The previous prime is 22205549. The next prime is 22205563. The reversal of 22205551 is 15550222.

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

It is a cyclic number.

It is not a de Polignac number, because 22205551 - 2¹ = 22205549 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 (22200551) 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, 25330 + ... + 26191.

It is an arithmetic number, because the mean of its divisors is an integer number (5564376).

Almost surely, 2^22205551 is an apocalyptic number.

22205551 is a deficient number, since it is larger than the sum of its proper divisors (51953).

22205551 is an equidigital number, since it uses as much as digits as its factorization.

22205551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51952.

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

The square root of 22205551 is about 4712.2766260057. The cubic root of 22205551 is about 281.0738989118.

Adding to 22205551 its reverse (15550222), we get a palindrome (37755773).

The spelling of 22205551 in words is "twenty-two million, two hundred five thousand, five hundred fifty-one".