12139691 has 2 divisors, whose sum is σ = 12139692. Its totient is φ = 12139690.

The previous prime is 12139679. The next prime is 12139697. The reversal of 12139691 is 19693121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12139691 - 2⁶ = 12139627 is a prime.

It is not a weakly prime, because it can be changed into another prime (12139697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069845 + 6069846.

It is an arithmetic number, because the mean of its divisors is an integer number (6069846).

Almost surely, 2^12139691 is an apocalyptic number.

12139691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139691 is an equidigital number, since it uses as much as digits as its factorization.

12139691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 32.

The square root of 12139691 is about 3484.2059353603. The cubic root of 12139691 is about 229.8277916993.

The spelling of 12139691 in words is "twelve million, one hundred thirty-nine thousand, six hundred ninety-one".