1243213241 has 2 divisors, whose sum is σ = 1243213242. Its totient is φ = 1243213240.

The previous prime is 1243213229. The next prime is 1243213327. The reversal of 1243213241 is 1423123421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1143792400 + 99420841 = 33820^2 + 9971^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243213241 - 2⁶ = 1243213177 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243213211) 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, 621606620 + 621606621.

It is an arithmetic number, because the mean of its divisors is an integer number (621606621).

Almost surely, 2^1243213241 is an apocalyptic number.

It is an amenable number.

1243213241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243213241 is an equidigital number, since it uses as much as digits as its factorization.

1243213241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 1243213241 is about 35259.2291606042. The cubic root of 1243213241 is about 1075.2642554971.

Adding to 1243213241 its reverse (1423123421), we get a palindrome (2666336662).

The spelling of 1243213241 in words is "one billion, two hundred forty-three million, two hundred thirteen thousand, two hundred forty-one".