1209765013 has 2 divisors, whose sum is σ = 1209765014. Its totient is φ = 1209765012.

The previous prime is 1209765001. The next prime is 1209765023. The reversal of 1209765013 is 3105679021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 938932164 + 270832849 = 30642^2 + 16457^2 .

It is an emirp because it is prime and its reverse (3105679021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209765013 - 2⁵ = 1209764981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1209765013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209765023) 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, 604882506 + 604882507.

It is an arithmetic number, because the mean of its divisors is an integer number (604882507).

Almost surely, 2^1209765013 is an apocalyptic number.

It is an amenable number.

1209765013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209765013 is an equidigital number, since it uses as much as digits as its factorization.

1209765013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 1209765013 is about 34781.6763972066. The cubic root of 1209765013 is about 1065.5332508481.

The spelling of 1209765013 in words is "one billion, two hundred nine million, seven hundred sixty-five thousand, thirteen".