12139731449 has 2 divisors, whose sum is σ = 12139731450. Its totient is φ = 12139731448.

The previous prime is 12139731421. The next prime is 12139731469. The reversal of 12139731449 is 94413793121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12134124025 + 5607424 = 110155^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 12139731449 - 2⁸ = 12139731193 is a prime.

It is not a weakly prime, because it can be changed into another prime (12139731419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069865724 + 6069865725.

It is an arithmetic number, because the mean of its divisors is an integer number (6069865725).

Almost surely, 2^12139731449 is an apocalyptic number.

It is an amenable number.

12139731449 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139731449 is an equidigital number, since it uses as much as digits as its factorization.

12139731449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The spelling of 12139731449 in words is "twelve billion, one hundred thirty-nine million, seven hundred thirty-one thousand, four hundred forty-nine".