12921679 has 2 divisors, whose sum is σ = 12921680. Its totient is φ = 12921678.

The previous prime is 12921673. The next prime is 12921763. The reversal of 12921679 is 97612921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12921679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12921673) 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, 6460839 + 6460840.

It is an arithmetic number, because the mean of its divisors is an integer number (6460840).

Almost surely, 2^12921679 is an apocalyptic number.

12921679 is a deficient number, since it is larger than the sum of its proper divisors (1).

12921679 is an equidigital number, since it uses as much as digits as its factorization.

12921679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 12921679 is about 3594.6736986825. The cubic root of 12921679 is about 234.6603150273.

The spelling of 12921679 in words is "twelve million, nine hundred twenty-one thousand, six hundred seventy-nine".