1209029009 has 2 divisors, whose sum is σ = 1209029010. Its totient is φ = 1209029008.

The previous prime is 1209028969. The next prime is 1209029027. The reversal of 1209029009 is 9009209021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126273600 + 82755409 = 33560^2 + 9097^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209029009 - 2⁸ = 1209028753 is a prime.

It is a super-2 number, since 2×1209029009² = 2923502289207044162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1209029039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604514504 + 604514505.

It is an arithmetic number, because the mean of its divisors is an integer number (604514505).

Almost surely, 2^1209029009 is an apocalyptic number.

It is an amenable number.

1209029009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209029009 is an equidigital number, since it uses as much as digits as its factorization.

1209029009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1209029009 is about 34771.0944463933. The cubic root of 1209029009 is about 1065.3171218700.

The spelling of 1209029009 in words is "one billion, two hundred nine million, twenty-nine thousand, nine".