12720569 has 2 divisors, whose sum is σ = 12720570. Its totient is φ = 12720568.

The previous prime is 12720559. The next prime is 12720581. The reversal of 12720569 is 96502721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12694969 + 25600 = 3563^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 12720569 - 2¹⁶ = 12655033 is a prime.

It is a super-2 number, since 2×12720569² = 323625751367522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12720529) 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, 6360284 + 6360285.

It is an arithmetic number, because the mean of its divisors is an integer number (6360285).

Almost surely, 2^12720569 is an apocalyptic number.

It is an amenable number.

12720569 is a deficient number, since it is larger than the sum of its proper divisors (1).

12720569 is an equidigital number, since it uses as much as digits as its factorization.

12720569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 12720569 is about 3566.5906689723. The cubic root of 12720569 is about 233.4365445889.

The spelling of 12720569 in words is "twelve million, seven hundred twenty thousand, five hundred sixty-nine".