12125990869 has 4 divisors (see below), whose sum is σ = 12126217644. Its totient is φ = 12125764096.

The previous prime is 12125990867. The next prime is 12125990881. The reversal of 12125990869 is 96809952121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96809952121 = 9041 ⋅10707881.

It can be written as a sum of positive squares in 2 ways, for example, as 8954836900 + 3171153969 = 94630^2 + 56313^2 .

It is a cyclic number.

It is not a de Polignac number, because 12125990869 - 2¹ = 12125990867 is a prime.

It is a super-4 number, since 4×12125990869⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12125990867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16149 + ... + 156565.

It is an arithmetic number, because the mean of its divisors is an integer number (3031554411).

Almost surely, 2^12125990869 is an apocalyptic number.

It is an amenable number.

12125990869 is a deficient number, since it is larger than the sum of its proper divisors (226775).

12125990869 is an equidigital number, since it uses as much as digits as its factorization.

12125990869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226774.

The product of its (nonzero) digits is 699840, while the sum is 52.

The spelling of 12125990869 in words is "twelve billion, one hundred twenty-five million, nine hundred ninety thousand, eight hundred sixty-nine".