22209545 has 4 divisors (see below), whose sum is σ = 26651460. Its totient is φ = 17767632.

The previous prime is 22209529. The next prime is 22209587. The reversal of 22209545 is 54590222.

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 5456896 + 16752649 = 2336^2 + 4093^2 .

It is a cyclic number.

It is not a de Polignac number, because 22209545 - 2⁴ = 22209529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2220950 + ... + 2220959.

It is an arithmetic number, because the mean of its divisors is an integer number (6662865).

Almost surely, 2^22209545 is an apocalyptic number.

It is an amenable number.

22209545 is a deficient number, since it is larger than the sum of its proper divisors (4441915).

22209545 is an equidigital number, since it uses as much as digits as its factorization.

22209545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441914.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 22209545 is about 4712.7003936172. The cubic root of 22209545 is about 281.0907496812.

Adding to 22209545 its reverse (54590222), we get a palindrome (76799767).

The spelling of 22209545 in words is "twenty-two million, two hundred nine thousand, five hundred forty-five".