12780869 has 2 divisors, whose sum is σ = 12780870. Its totient is φ = 12780868.

The previous prime is 12780827. The next prime is 12780871. The reversal of 12780869 is 96808721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12687844 + 93025 = 3562^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 12780869 - 2⁸ = 12780613 is a prime.

It is a super-2 number, since 2×12780869² = 326701224790322, which contains 22 as substring.

Together with 12780871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12780809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390434 + 6390435.

It is an arithmetic number, because the mean of its divisors is an integer number (6390435).

Almost surely, 2^12780869 is an apocalyptic number.

It is an amenable number.

12780869 is a deficient number, since it is larger than the sum of its proper divisors (1).

12780869 is an equidigital number, since it uses as much as digits as its factorization.

12780869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 12780869 is about 3575.0341257112. The cubic root of 12780869 is about 233.8048205660.

The spelling of 12780869 in words is "twelve million, seven hundred eighty thousand, eight hundred sixty-nine".