1209999969029 has 2 divisors, whose sum is σ = 1209999969030. Its totient is φ = 1209999969028.

The previous prime is 1209999969019. The next prime is 1209999969041. The reversal of 1209999969029 is 9209699999021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 764396992804 + 445602976225 = 874298^2 + 667535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209999969029 - 2³⁶ = 1141280492293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209999969019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604999984514 + 604999984515.

It is an arithmetic number, because the mean of its divisors is an integer number (604999984515).

Almost surely, 2^{1209999969029} is an apocalyptic number.

It is an amenable number.

1209999969029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209999969029 is an equidigital number, since it uses as much as digits as its factorization.

1209999969029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 114791256, while the sum is 74.

The spelling of 1209999969029 in words is "one trillion, two hundred nine billion, nine hundred ninety-nine million, nine hundred sixty-nine thousand, twenty-nine".