1213665029 has 2 divisors, whose sum is σ = 1213665030. Its totient is φ = 1213665028.

The previous prime is 1213665007. The next prime is 1213665031. The reversal of 1213665029 is 9205663121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069617025 + 144048004 = 32705^2 + 12002^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213665029 is a prime.

Together with 1213665031, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213665029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213665329) 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, 606832514 + 606832515.

It is an arithmetic number, because the mean of its divisors is an integer number (606832515).

Almost surely, 2^1213665029 is an apocalyptic number.

It is an amenable number.

1213665029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213665029 is an equidigital number, since it uses as much as digits as its factorization.

1213665029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1213665029 is about 34837.6955179300. The cubic root of 1213665029 is about 1066.6770374751.

The spelling of 1213665029 in words is "one billion, two hundred thirteen million, six hundred sixty-five thousand, twenty-nine".