1243442113 has 2 divisors, whose sum is σ = 1243442114. Its totient is φ = 1243442112.

The previous prime is 1243442089. The next prime is 1243442129. The reversal of 1243442113 is 3112443421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228642704 + 14799409 = 35052^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243442113 - 2⁹ = 1243441601 is a prime.

It is a super-2 number, since 2×1243442113² = 3092296576763809538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1243442183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621721056 + 621721057.

It is an arithmetic number, because the mean of its divisors is an integer number (621721057).

Almost surely, 2^1243442113 is an apocalyptic number.

It is an amenable number.

1243442113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243442113 is an equidigital number, since it uses as much as digits as its factorization.

1243442113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 25.

The square root of 1243442113 is about 35262.4745728373. The cubic root of 1243442113 is about 1075.3302358058.

Adding to 1243442113 its reverse (3112443421), we get a palindrome (4355885534).

The spelling of 1243442113 in words is "one billion, two hundred forty-three million, four hundred forty-two thousand, one hundred thirteen".