18912971141 has 2 divisors, whose sum is σ = 18912971142. Its totient is φ = 18912971140.

The previous prime is 18912971131. The next prime is 18912971153. The reversal of 18912971141 is 14117921981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18042131041 + 870840100 = 134321^2 + 29510^2 .

It is a cyclic number.

It is not a de Polignac number, because 18912971141 - 2¹⁰ = 18912970117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18912971092 and 18912971101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18912971111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456485570 + 9456485571.

It is an arithmetic number, because the mean of its divisors is an integer number (9456485571).

Almost surely, 2^18912971141 is an apocalyptic number.

It is an amenable number.

18912971141 is a deficient number, since it is larger than the sum of its proper divisors (1).

18912971141 is an equidigital number, since it uses as much as digits as its factorization.

18912971141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 44.

The spelling of 18912971141 in words is "eighteen billion, nine hundred twelve million, nine hundred seventy-one thousand, one hundred forty-one".