1211853902317 has 2 divisors, whose sum is σ = 1211853902318. Its totient is φ = 1211853902316.

The previous prime is 1211853902299. The next prime is 1211853902419. The reversal of 1211853902317 is 7132093581121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173551889636 + 38302012681 = 1083306^2 + 195709^2 .

It is an emirp because it is prime and its reverse (7132093581121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211853902317 - 2¹⁵ = 1211853869549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211853900317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605926951158 + 605926951159.

It is an arithmetic number, because the mean of its divisors is an integer number (605926951159).

Almost surely, 2^{1211853902317} is an apocalyptic number.

It is an amenable number.

1211853902317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211853902317 is an equidigital number, since it uses as much as digits as its factorization.

1211853902317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 1211853902317 in words is "one trillion, two hundred eleven billion, eight hundred fifty-three million, nine hundred two thousand, three hundred seventeen".