12138281569 has 4 divisors (see below), whose sum is σ = 12138686896. Its totient is φ = 12137876244.

The previous prime is 12138281563. The next prime is 12138281581. The reversal of 12138281569 is 96518283121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12138281569 is a prime.

It is a super-2 number, since 2×12138281569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12138281563) 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, 153819 + ... + 218944.

It is an arithmetic number, because the mean of its divisors is an integer number (3034671724).

Almost surely, 2^12138281569 is an apocalyptic number.

It is an amenable number.

12138281569 is a deficient number, since it is larger than the sum of its proper divisors (405327).

12138281569 is an equidigital number, since it uses as much as digits as its factorization.

12138281569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405326.

The product of its digits is 207360, while the sum is 46.

The spelling of 12138281569 in words is "twelve billion, one hundred thirty-eight million, two hundred eighty-one thousand, five hundred sixty-nine".