12139913 has 2 divisors, whose sum is σ = 12139914. Its totient is φ = 12139912.

The previous prime is 12139891. The next prime is 12139943. The reversal of 12139913 is 31993121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11580409 + 559504 = 3403^2 + 748^2 .

It is an emirp because it is prime and its reverse (31993121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12139913 - 2⁶ = 12139849 is a prime.

It is not a weakly prime, because it can be changed into another prime (12139943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069956 + 6069957.

It is an arithmetic number, because the mean of its divisors is an integer number (6069957).

Almost surely, 2^12139913 is an apocalyptic number.

It is an amenable number.

12139913 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139913 is an equidigital number, since it uses as much as digits as its factorization.

12139913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 29.

The square root of 12139913 is about 3484.2377932627. The cubic root of 12139913 is about 229.8291926536.

The spelling of 12139913 in words is "twelve million, one hundred thirty-nine thousand, nine hundred thirteen".