1243200017 has 2 divisors, whose sum is σ = 1243200018. Its totient is φ = 1243200016.

The previous prime is 1243199983. The next prime is 1243200019. The reversal of 1243200017 is 7100023421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002608896 + 240591121 = 31664^2 + 15511^2 .

It is an emirp because it is prime and its reverse (7100023421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243200017 - 2¹⁶ = 1243134481 is a prime.

Together with 1243200019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1243200019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621600008 + 621600009.

It is an arithmetic number, because the mean of its divisors is an integer number (621600009).

Almost surely, 2^1243200017 is an apocalyptic number.

It is an amenable number.

1243200017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243200017 is an equidigital number, since it uses as much as digits as its factorization.

1243200017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1243200017 is about 35259.0416347353. The cubic root of 1243200017 is about 1075.2604429721.

Adding to 1243200017 its reverse (7100023421), we get a palindrome (8343223438).

The spelling of 1243200017 in words is "one billion, two hundred forty-three million, two hundred thousand, seventeen".