12863561 has 2 divisors, whose sum is σ = 12863562. Its totient is φ = 12863560.

The previous prime is 12863537. The next prime is 12863569. The reversal of 12863561 is 16536821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 40000 = 3581^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 12863561 - 2¹⁸ = 12601417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12863569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6431780 + 6431781.

It is an arithmetic number, because the mean of its divisors is an integer number (6431781).

Almost surely, 2^12863561 is an apocalyptic number.

It is an amenable number.

12863561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12863561 is an equidigital number, since it uses as much as digits as its factorization.

12863561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 12863561 is about 3586.5806836038. The cubic root of 12863561 is about 234.3079746950.

The spelling of 12863561 in words is "twelve million, eight hundred sixty-three thousand, five hundred sixty-one".