1243420117 has 2 divisors, whose sum is σ = 1243420118. Its totient is φ = 1243420116.

The previous prime is 1243420093. The next prime is 1243420127. The reversal of 1243420117 is 7110243421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1212850276 + 30569841 = 34826^2 + 5529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243420117 - 2¹¹ = 1243418069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243420091 and 1243420100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243420127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621710058 + 621710059.

It is an arithmetic number, because the mean of its divisors is an integer number (621710059).

Almost surely, 2^1243420117 is an apocalyptic number.

It is an amenable number.

1243420117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243420117 is an equidigital number, since it uses as much as digits as its factorization.

1243420117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1243420117 is about 35262.1626818322. The cubic root of 1243420117 is about 1075.3238950460.

Adding to 1243420117 its reverse (7110243421), we get a palindrome (8353663538).

The spelling of 1243420117 in words is "one billion, two hundred forty-three million, four hundred twenty thousand, one hundred seventeen".