224548721 has 2 divisors, whose sum is σ = 224548722. Its totient is φ = 224548720.

The previous prime is 224548679. The next prime is 224548729. The reversal of 224548721 is 127845422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214212496 + 10336225 = 14636^2 + 3215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224548721 is a prime.

It is not a weakly prime, because it can be changed into another prime (224548729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112274360 + 112274361.

It is an arithmetic number, because the mean of its divisors is an integer number (112274361).

Almost surely, 2^224548721 is an apocalyptic number.

It is an amenable number.

224548721 is a deficient number, since it is larger than the sum of its proper divisors (1).

224548721 is an equidigital number, since it uses as much as digits as its factorization.

224548721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 35.

The square root of 224548721 is about 14984.9498163991. The cubic root of 224548721 is about 607.8132947974.

The spelling of 224548721 in words is "two hundred twenty-four million, five hundred forty-eight thousand, seven hundred twenty-one".