12912139 has 2 divisors, whose sum is σ = 12912140. Its totient is φ = 12912138.

The previous prime is 12912103. The next prime is 12912157. The reversal of 12912139 is 93121921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12912139 - 2¹¹ = 12910091 is a prime.

It is not a weakly prime, because it can be changed into another prime (12912199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6456069 + 6456070.

It is an arithmetic number, because the mean of its divisors is an integer number (6456070).

Almost surely, 2^12912139 is an apocalyptic number.

12912139 is a deficient number, since it is larger than the sum of its proper divisors (1).

12912139 is an equidigital number, since it uses as much as digits as its factorization.

12912139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 28.

The square root of 12912139 is about 3593.3464903903. The cubic root of 12912139 is about 234.6025513636.

The spelling of 12912139 in words is "twelve million, nine hundred twelve thousand, one hundred thirty-nine".