1230120209 has 2 divisors, whose sum is σ = 1230120210. Its totient is φ = 1230120208.

The previous prime is 1230120197. The next prime is 1230120223. The reversal of 1230120209 is 9020210321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902401600 + 327718609 = 30040^2 + 18103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230120209 - 2⁴ = 1230120193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1230120259) 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, 615060104 + 615060105.

It is an arithmetic number, because the mean of its divisors is an integer number (615060105).

Almost surely, 2^1230120209 is an apocalyptic number.

It is an amenable number.

1230120209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230120209 is an equidigital number, since it uses as much as digits as its factorization.

1230120209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1230120209 is about 35073.0695691153. The cubic root of 1230120209 is about 1071.4761728583.

The spelling of 1230120209 in words is "one billion, two hundred thirty million, one hundred twenty thousand, two hundred nine".