12139109 has 2 divisors, whose sum is σ = 12139110. Its totient is φ = 12139108.

The previous prime is 12139103. The next prime is 12139129. The reversal of 12139109 is 90193121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11710084 + 429025 = 3422^2 + 655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12139109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12139103) 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, 6069554 + 6069555.

It is an arithmetic number, because the mean of its divisors is an integer number (6069555).

Almost surely, 2^12139109 is an apocalyptic number.

It is an amenable number.

12139109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139109 is an equidigital number, since it uses as much as digits as its factorization.

12139109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 12139109 is about 3484.1224146117. The cubic root of 12139109 is about 229.8241188460.

The spelling of 12139109 in words is "twelve million, one hundred thirty-nine thousand, one hundred nine".