1211100116309 has 2 divisors, whose sum is σ = 1211100116310. Its totient is φ = 1211100116308.

The previous prime is 1211100116299. The next prime is 1211100116327. The reversal of 1211100116309 is 9036110011121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929001039409 + 282099076900 = 963847^2 + 531130^2 .

It is an emirp because it is prime and its reverse (9036110011121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211100116309 - 2³² = 1206805149013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211100116329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550058154 + 605550058155.

It is an arithmetic number, because the mean of its divisors is an integer number (605550058155).

Almost surely, 2^{1211100116309} is an apocalyptic number.

It is an amenable number.

1211100116309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211100116309 is an equidigital number, since it uses as much as digits as its factorization.

1211100116309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 1211100116309 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred sixteen thousand, three hundred nine".