12138879289 has 2 divisors, whose sum is σ = 12138879290. Its totient is φ = 12138879288.

The previous prime is 12138879271. The next prime is 12138879323. The reversal of 12138879289 is 98297883121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8573834025 + 3565045264 = 92595^2 + 59708^2 .

It is a cyclic number.

It is not a de Polignac number, because 12138879289 - 2¹⁷ = 12138748217 is a prime.

It is not a weakly prime, because it can be changed into another prime (12138879209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069439644 + 6069439645.

It is an arithmetic number, because the mean of its divisors is an integer number (6069439645).

Almost surely, 2^12138879289 is an apocalyptic number.

It is an amenable number.

12138879289 is a deficient number, since it is larger than the sum of its proper divisors (1).

12138879289 is an equidigital number, since it uses as much as digits as its factorization.

12138879289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 58.

The spelling of 12138879289 in words is "twelve billion, one hundred thirty-eight million, eight hundred seventy-nine thousand, two hundred eighty-nine".