22451018 has 4 divisors (see below), whose sum is σ = 33676530. Its totient is φ = 11225508.

The previous prime is 22451003. The next prime is 22451029. The reversal of 22451018 is 81015422.

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

It can be written as a sum of positive squares in only one way, i.e., 22401289 + 49729 = 4733^2 + 223^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22450984 and 22451002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5612753 + ... + 5612756.

Almost surely, 2^22451018 is an apocalyptic number.

22451018 is a deficient number, since it is larger than the sum of its proper divisors (11225512).

22451018 is a wasteful number, since it uses less digits than its factorization.

22451018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11225511.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 22451018 is about 4738.2505210257. The cubic root of 22451018 is about 282.1057983723.

The spelling of 22451018 in words is "twenty-two million, four hundred fifty-one thousand, eighteen".