12865553 has 2 divisors, whose sum is σ = 12865554. Its totient is φ = 12865552.

The previous prime is 12865543. The next prime is 12865613. The reversal of 12865553 is 35556821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11444689 + 1420864 = 3383^2 + 1192^2 .

It is an emirp because it is prime and its reverse (35556821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12865553 - 2⁴ = 12865537 is a prime.

It is not a weakly prime, because it can be changed into another prime (12865543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6432776 + 6432777.

It is an arithmetic number, because the mean of its divisors is an integer number (6432777).

Almost surely, 2^12865553 is an apocalyptic number.

It is an amenable number.

12865553 is a deficient number, since it is larger than the sum of its proper divisors (1).

12865553 is an equidigital number, since it uses as much as digits as its factorization.

12865553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 35.

The square root of 12865553 is about 3586.8583746783. The cubic root of 12865553 is about 234.3200687384.

The spelling of 12865553 in words is "twelve million, eight hundred sixty-five thousand, five hundred fifty-three".