1861833091211 has 2 divisors, whose sum is σ = 1861833091212. Its totient is φ = 1861833091210.

The previous prime is 1861833091177. The next prime is 1861833091219. The reversal of 1861833091211 is 1121903381681.

It is a strong prime.

It is an emirp because it is prime and its reverse (1121903381681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1861833091211 - 2³⁰ = 1860759349387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1861833091219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930916545605 + 930916545606.

It is an arithmetic number, because the mean of its divisors is an integer number (930916545606).

Almost surely, 2^{1861833091211} is an apocalyptic number.

1861833091211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861833091211 is an equidigital number, since it uses as much as digits as its factorization.

1861833091211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 44.

The spelling of 1861833091211 in words is "one trillion, eight hundred sixty-one billion, eight hundred thirty-three million, ninety-one thousand, two hundred eleven".