1123797209 has 2 divisors, whose sum is σ = 1123797210. Its totient is φ = 1123797208.

The previous prime is 1123797203. The next prime is 1123797221. The reversal of 1123797209 is 9027973211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013021584 + 110775625 = 31828^2 + 10525^2 .

It is an emirp because it is prime and its reverse (9027973211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1123797209 - 2⁸ = 1123796953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1123797203) 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, 561898604 + 561898605.

It is an arithmetic number, because the mean of its divisors is an integer number (561898605).

Almost surely, 2^1123797209 is an apocalyptic number.

It is an amenable number.

1123797209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123797209 is an equidigital number, since it uses as much as digits as its factorization.

1123797209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 1123797209 is about 33523.0847178478. The cubic root of 1123797209 is about 1039.6711265975.

The spelling of 1123797209 in words is "one billion, one hundred twenty-three million, seven hundred ninety-seven thousand, two hundred nine".