1244040209 has 2 divisors, whose sum is σ = 1244040210. Its totient is φ = 1244040208.

The previous prime is 1244040151. The next prime is 1244040247. The reversal of 1244040209 is 9020404421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 778689025 + 465351184 = 27905^2 + 21572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244040209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1244042209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622020104 + 622020105.

It is an arithmetic number, because the mean of its divisors is an integer number (622020105).

Almost surely, 2^1244040209 is an apocalyptic number.

It is an amenable number.

1244040209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244040209 is an equidigital number, since it uses as much as digits as its factorization.

1244040209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1244040209 is about 35270.9541832937. The cubic root of 1244040209 is about 1075.5026195501.

The spelling of 1244040209 in words is "one billion, two hundred forty-four million, forty thousand, two hundred nine".