12516289 has 2 divisors, whose sum is σ = 12516290. Its totient is φ = 12516288.

The previous prime is 12516277. The next prime is 12516299. The reversal of 12516289 is 98261521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7263025 + 5253264 = 2695^2 + 2292^2 .

It is a cyclic number.

It is not a de Polignac number, because 12516289 - 2¹⁵ = 12483521 is a prime.

It is not a weakly prime, because it can be changed into another prime (12516299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6258144 + 6258145.

It is an arithmetic number, because the mean of its divisors is an integer number (6258145).

Almost surely, 2^12516289 is an apocalyptic number.

It is an amenable number.

12516289 is a deficient number, since it is larger than the sum of its proper divisors (1).

12516289 is an equidigital number, since it uses as much as digits as its factorization.

12516289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 12516289 is about 3537.8367684222. The cubic root of 12516289 is about 232.1802070442.

The spelling of 12516289 in words is "twelve million, five hundred sixteen thousand, two hundred eighty-nine".