1212401209 has 2 divisors, whose sum is σ = 1212401210. Its totient is φ = 1212401208.

The previous prime is 1212401167. The next prime is 1212401213. The reversal of 1212401209 is 9021042121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071907600 + 140493609 = 32740^2 + 11853^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212401209 - 2⁷ = 1212401081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212401209.

It is not a weakly prime, because it can be changed into another prime (1212401249) 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, 606200604 + 606200605.

It is an arithmetic number, because the mean of its divisors is an integer number (606200605).

Almost surely, 2^1212401209 is an apocalyptic number.

It is an amenable number.

1212401209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212401209 is an equidigital number, since it uses as much as digits as its factorization.

1212401209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1212401209 is about 34819.5521079752. The cubic root of 1212401209 is about 1066.3066563170.

The spelling of 1212401209 in words is "one billion, two hundred twelve million, four hundred one thousand, two hundred nine".