12779321 has 2 divisors, whose sum is σ = 12779322. Its totient is φ = 12779320.

The previous prime is 12779311. The next prime is 12779339. The reversal of 12779321 is 12397721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 3013696 = 3125^2 + 1736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12779321 is a prime.

It is a super-2 number, since 2×12779321² = 326622090442082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12779311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389660 + 6389661.

It is an arithmetic number, because the mean of its divisors is an integer number (6389661).

Almost surely, 2^12779321 is an apocalyptic number.

It is an amenable number.

12779321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12779321 is an equidigital number, since it uses as much as digits as its factorization.

12779321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 32.

The square root of 12779321 is about 3574.8176177254. The cubic root of 12779321 is about 233.7953808199.

The spelling of 12779321 in words is "twelve million, seven hundred seventy-nine thousand, three hundred twenty-one".