12131944669 has 4 divisors (see below), whose sum is σ = 13065171196. Its totient is φ = 11198718144.

The previous prime is 12131944663. The next prime is 12131944673. The reversal of 12131944669 is 96644913121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2576882169 + 9555062500 = 50763^2 + 97750^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131944669 - 2¹⁹ = 12131420381 is a prime.

It is a super-2 number, since 2×12131944669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131944663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466613244 + ... + 466613269.

It is an arithmetic number, because the mean of its divisors is an integer number (3266292799).

Almost surely, 2^12131944669 is an apocalyptic number.

It is an amenable number.

12131944669 is a deficient number, since it is larger than the sum of its proper divisors (933226527).

12131944669 is an equidigital number, since it uses as much as digits as its factorization.

12131944669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933226526.

The product of its digits is 279936, while the sum is 46.

The spelling of 12131944669 in words is "twelve billion, one hundred thirty-one million, nine hundred forty-four thousand, six hundred sixty-nine".