22218609 has 36 divisors (see below), whose sum is σ = 36677904. Its totient is φ = 11926656.

The previous prime is 22218601. The next prime is 22218617. The reversal of 22218609 is 90681222.

It is an interprime number because it is at equal distance from previous prime (22218601) and next prime (22218617).

It is not a de Polignac number, because 22218609 - 2³ = 22218601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22218601) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42222 + ... + 42744.

Almost surely, 2^22218609 is an apocalyptic number.

It is an amenable number.

22218609 is a deficient number, since it is larger than the sum of its proper divisors (14459295).

22218609 is a wasteful number, since it uses less digits than its factorization.

22218609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 22218609 is about 4713.6619522405. The cubic root of 22218609 is about 281.1289833931.

The spelling of 22218609 in words is "twenty-two million, two hundred eighteen thousand, six hundred nine".