1211100039161 has 2 divisors, whose sum is σ = 1211100039162. Its totient is φ = 1211100039160.

The previous prime is 1211100039151. The next prime is 1211100039217. The reversal of 1211100039161 is 1619300011121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 674369440000 + 536730599161 = 821200^2 + 732619^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211100039161 - 2²⁶ = 1211032930297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211100039161.

It is not a weakly prime, because it can be changed into another prime (1211100039151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550019580 + 605550019581.

It is an arithmetic number, because the mean of its divisors is an integer number (605550019581).

Almost surely, 2^{1211100039161} is an apocalyptic number.

It is an amenable number.

1211100039161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211100039161 is an equidigital number, since it uses as much as digits as its factorization.

1211100039161 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 1211100039161 in words is "one trillion, two hundred eleven billion, one hundred million, thirty-nine thousand, one hundred sixty-one".