22518145 has 8 divisors (see below), whose sum is σ = 29100456. Its totient is φ = 16628736.

The previous prime is 22518137. The next prime is 22518179. The reversal of 22518145 is 54181522.

It can be written as a sum of positive squares in 4 ways, for example, as 690561 + 21827584 = 831^2 + 4672^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22518145 - 2³ = 22518137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173152 + ... + 173281.

It is an arithmetic number, because the mean of its divisors is an integer number (3637557).

Almost surely, 2^22518145 is an apocalyptic number.

It is an amenable number.

22518145 is a deficient number, since it is larger than the sum of its proper divisors (6582311).

22518145 is a wasteful number, since it uses less digits than its factorization.

22518145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346451.

The product of its digits is 3200, while the sum is 28.

The square root of 22518145 is about 4745.3287557344. The cubic root of 22518145 is about 282.3866776010.

Adding to 22518145 its reverse (54181522), we get a palindrome (76699667).

The spelling of 22518145 in words is "twenty-two million, five hundred eighteen thousand, one hundred forty-five".