1224433981 has 2 divisors, whose sum is σ = 1224433982. Its totient is φ = 1224433980.

The previous prime is 1224433949. The next prime is 1224434039. The reversal of 1224433981 is 1893344221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1146905956 + 77528025 = 33866^2 + 8805^2 .

It is an emirp because it is prime and its reverse (1893344221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1224433981 - 2⁵ = 1224433949 is a prime.

It is a super-2 number, since 2×1224433981² = 2998477147655016722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1224433981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1224433081) 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, 612216990 + 612216991.

It is an arithmetic number, because the mean of its divisors is an integer number (612216991).

Almost surely, 2^1224433981 is an apocalyptic number.

It is an amenable number.

1224433981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224433981 is an equidigital number, since it uses as much as digits as its factorization.

1224433981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 1224433981 is about 34991.9130800246. The cubic root of 1224433981 is about 1069.8226570150.

It can be divided in two parts, 12244 and 33981, that added together give a square (46225 = 215²).

The spelling of 1224433981 in words is "one billion, two hundred twenty-four million, four hundred thirty-three thousand, nine hundred eighty-one".