1224556889 has 2 divisors, whose sum is σ = 1224556890. Its totient is φ = 1224556888.

The previous prime is 1224556873. The next prime is 1224556939. The reversal of 1224556889 is 9886554221.

It is a happy number.

It is an a-pointer prime, because the next prime (1224556939) can be obtained adding 1224556889 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191975625 + 32581264 = 34525^2 + 5708^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224556889 - 2⁴ = 1224556873 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1224556819) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612278444 + 612278445.

It is an arithmetic number, because the mean of its divisors is an integer number (612278445).

Almost surely, 2^1224556889 is an apocalyptic number.

It is an amenable number.

1224556889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224556889 is an equidigital number, since it uses as much as digits as its factorization.

1224556889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 50.

The square root of 1224556889 is about 34993.6692703123. The cubic root of 1224556889 is about 1069.8584518845.

The spelling of 1224556889 in words is "one billion, two hundred twenty-four million, five hundred fifty-six thousand, eight hundred eighty-nine".