12779969 has 2 divisors, whose sum is σ = 12779970. Its totient is φ = 12779968.

The previous prime is 12779953. The next prime is 12779993. The reversal of 12779969 is 96997721.

12779969 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9120400 + 3659569 = 3020^2 + 1913^2 .

It is a cyclic number.

It is not a de Polignac number, because 12779969 - 2⁴ = 12779953 is a prime.

It is a super-2 number, since 2×12779969² = 326655215281922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12779939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389984 + 6389985.

It is an arithmetic number, because the mean of its divisors is an integer number (6389985).

Almost surely, 2^12779969 is an apocalyptic number.

It is an amenable number.

12779969 is a deficient number, since it is larger than the sum of its proper divisors (1).

12779969 is an equidigital number, since it uses as much as digits as its factorization.

12779969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 50.

The square root of 12779969 is about 3574.9082505709. The cubic root of 12779969 is about 233.7993324343.

The spelling of 12779969 in words is "twelve million, seven hundred seventy-nine thousand, nine hundred sixty-nine".