12989791 has 2 divisors, whose sum is σ = 12989792. Its totient is φ = 12989790.

The previous prime is 12989789. The next prime is 12989803. The reversal of 12989791 is 19798921.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19798921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12989791 - 2¹ = 12989789 is a prime.

Together with 12989789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12989191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6494895 + 6494896.

It is an arithmetic number, because the mean of its divisors is an integer number (6494896).

Almost surely, 2^12989791 is an apocalyptic number.

12989791 is a deficient number, since it is larger than the sum of its proper divisors (1).

12989791 is an equidigital number, since it uses as much as digits as its factorization.

12989791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 46.

The square root of 12989791 is about 3604.1352638324. The cubic root of 12989791 is about 235.0719019457.

The spelling of 12989791 in words is "twelve million, nine hundred eighty-nine thousand, seven hundred ninety-one".