1224200561 has 2 divisors, whose sum is σ = 1224200562. Its totient is φ = 1224200560.

The previous prime is 1224200513. The next prime is 1224200563. The reversal of 1224200561 is 1650024221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667240561 + 556960000 = 25831^2 + 23600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1224200561 is a prime.

Together with 1224200563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1224200563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612100280 + 612100281.

It is an arithmetic number, because the mean of its divisors is an integer number (612100281).

Almost surely, 2^1224200561 is an apocalyptic number.

It is an amenable number.

1224200561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224200561 is an equidigital number, since it uses as much as digits as its factorization.

1224200561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1224200561 is about 34988.5775789757. The cubic root of 1224200561 is about 1069.7546708057.

Adding to 1224200561 its reverse (1650024221), we get a palindrome (2874224782).

The spelling of 1224200561 in words is "one billion, two hundred twenty-four million, two hundred thousand, five hundred sixty-one".