12139609 has 2 divisors, whose sum is σ = 12139610. Its totient is φ = 12139608.

The previous prime is 12139591. The next prime is 12139619. The reversal of 12139609 is 90693121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8139609 + 4000000 = 2853^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 12139609 - 2⁵ = 12139577 is a prime.

It is not a weakly prime, because it can be changed into another prime (12139619) 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, 6069804 + 6069805.

It is an arithmetic number, because the mean of its divisors is an integer number (6069805).

Almost surely, 2^12139609 is an apocalyptic number.

It is an amenable number.

12139609 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139609 is an equidigital number, since it uses as much as digits as its factorization.

12139609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 12139609 is about 3484.1941679533. The cubic root of 12139609 is about 229.8272742253.

The spelling of 12139609 in words is "twelve million, one hundred thirty-nine thousand, six hundred nine".