12978611 has 2 divisors, whose sum is σ = 12978612. Its totient is φ = 12978610.

The previous prime is 12978593. The next prime is 12978613. The reversal of 12978611 is 11687921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12978611 - 2¹⁸ = 12716467 is a prime.

Together with 12978613, 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 (12978613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6489305 + 6489306.

It is an arithmetic number, because the mean of its divisors is an integer number (6489306).

Almost surely, 2^12978611 is an apocalyptic number.

12978611 is a deficient number, since it is larger than the sum of its proper divisors (1).

12978611 is an equidigital number, since it uses as much as digits as its factorization.

12978611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 12978611 is about 3602.5839337897. The cubic root of 12978611 is about 235.0044423485.

The spelling of 12978611 in words is "twelve million, nine hundred seventy-eight thousand, six hundred eleven".