22449281 has 4 divisors (see below), whose sum is σ = 22817364. Its totient is φ = 22081200.

The previous prime is 22449257. The next prime is 22449283. The reversal of 22449281 is 18294422.

It is a happy number.

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 3168400 + 19280881 = 1780^2 + 4391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22449281 is a prime.

It is a super-2 number, since 2×22449281² = 1007940434833922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22449283) 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, 183950 + ... + 184071.

It is an arithmetic number, because the mean of its divisors is an integer number (5704341).

Almost surely, 2^22449281 is an apocalyptic number.

It is an amenable number.

22449281 is a deficient number, since it is larger than the sum of its proper divisors (368083).

22449281 is an equidigital number, since it uses as much as digits as its factorization.

22449281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368082.

The product of its digits is 9216, while the sum is 32.

The square root of 22449281 is about 4738.0672219799. The cubic root of 22449281 is about 282.0985228239.

The spelling of 22449281 in words is "twenty-two million, four hundred forty-nine thousand, two hundred eighty-one".