224666521 has 8 divisors (see below), whose sum is σ = 228429000. Its totient is φ = 220934400.

The previous prime is 224666489. The next prime is 224666531. The reversal of 224666521 is 125666422.

It can be written as a sum of positive squares in 4 ways, for example, as 86862400 + 137804121 = 9320^2 + 11739^2 .

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 224666521 - 2⁵ = 224666489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224666531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7585 + ... + 22513.

It is an arithmetic number, because the mean of its divisors is an integer number (28553625).

Almost surely, 2^224666521 is an apocalyptic number.

It is an amenable number.

224666521 is a deficient number, since it is larger than the sum of its proper divisors (3762479).

224666521 is a wasteful number, since it uses less digits than its factorization.

224666521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15179.

The product of its digits is 34560, while the sum is 34.

The square root of 224666521 is about 14988.8799114544. The cubic root of 224666521 is about 607.9195640720.

Subtracting from 224666521 its reverse (125666422), we obtain a palindrome (99000099).

The spelling of 224666521 in words is "two hundred twenty-four million, six hundred sixty-six thousand, five hundred twenty-one".