224751521 has 2 divisors, whose sum is σ = 224751522. Its totient is φ = 224751520.

The previous prime is 224751517. The next prime is 224751529. The reversal of 224751521 is 125157422.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217887121 + 6864400 = 14761^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 224751521 - 2² = 224751517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (224751529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112375760 + 112375761.

It is an arithmetic number, because the mean of its divisors is an integer number (112375761).

Almost surely, 2^224751521 is an apocalyptic number.

It is an amenable number.

224751521 is a deficient number, since it is larger than the sum of its proper divisors (1).

224751521 is an equidigital number, since it uses as much as digits as its factorization.

224751521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 29.

The square root of 224751521 is about 14991.7150786693. The cubic root of 224751521 is about 607.9962208690.

The spelling of 224751521 in words is "two hundred twenty-four million, seven hundred fifty-one thousand, five hundred twenty-one".