1212304109 has 2 divisors, whose sum is σ = 1212304110. Its totient is φ = 1212304108.

The previous prime is 1212304091. The next prime is 1212304189. The reversal of 1212304109 is 9014032121.

Together with previous prime (1212304091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1156204009 + 56100100 = 34003^2 + 7490^2 .

It is an emirp because it is prime and its reverse (9014032121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212304109 - 2²⁰ = 1211255533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212304189) 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, 606152054 + 606152055.

It is an arithmetic number, because the mean of its divisors is an integer number (606152055).

Almost surely, 2^1212304109 is an apocalyptic number.

It is an amenable number.

1212304109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212304109 is an equidigital number, since it uses as much as digits as its factorization.

1212304109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1212304109 is about 34818.1577485082. The cubic root of 1212304109 is about 1066.2781890792.

The spelling of 1212304109 in words is "one billion, two hundred twelve million, three hundred four thousand, one hundred nine".