12691379 has 2 divisors, whose sum is σ = 12691380. Its totient is φ = 12691378.

The previous prime is 12691361. The next prime is 12691381. The reversal of 12691379 is 97319621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12691379 is a prime.

It is a super-2 number, since 2×12691379² = 322142201843282, which contains 22 as substring.

Together with 12691381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12691079) 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, 6345689 + 6345690.

It is an arithmetic number, because the mean of its divisors is an integer number (6345690).

Almost surely, 2^12691379 is an apocalyptic number.

12691379 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691379 is an equidigital number, since it uses as much as digits as its factorization.

12691379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 12691379 is about 3562.4961754365. The cubic root of 12691379 is about 233.2578515485.

The spelling of 12691379 in words is "twelve million, six hundred ninety-one thousand, three hundred seventy-nine".