12126194161 has 3 divisors (see below), whose sum is σ = 12126304281. Its totient is φ = 12126084042.

The previous prime is 12126194141. The next prime is 12126194219. The reversal of 12126194161 is 16149162121.

The square root of 12126194161 is 110119.

It is a perfect power (a square), and thus also a powerful number.

12126194161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16149162121 = 17 ⋅949950713.

It is not a de Polignac number, because 12126194161 - 2⁹ = 12126193649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12126194131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55060 + ... + 165178.

It is an arithmetic number, because the mean of its divisors is an integer number (4042101427).

Almost surely, 2^12126194161 is an apocalyptic number.

12126194161 is the 110119-th square number.

12126194161 is the 55060-th centered octagonal number.

It is an amenable number.

12126194161 is a deficient number, since it is larger than the sum of its proper divisors (110120).

12126194161 is an frugal number, since it uses more digits than its factorization.

12126194161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220238 (or 110119 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

Multiplying 12126194161 by its product of digits (5184), we get a square (62862190530624 = 7928568²).

The spelling of 12126194161 in words is "twelve billion, one hundred twenty-six million, one hundred ninety-four thousand, one hundred sixty-one".