12539663 has 2 divisors, whose sum is σ = 12539664. Its totient is φ = 12539662.

The previous prime is 12539603. The next prime is 12539701. The reversal of 12539663 is 36693521.

It is a strong prime.

It is an emirp because it is prime and its reverse (36693521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12539663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12539603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6269831 + 6269832.

It is an arithmetic number, because the mean of its divisors is an integer number (6269832).

Almost surely, 2^12539663 is an apocalyptic number.

12539663 is a deficient number, since it is larger than the sum of its proper divisors (1).

12539663 is an equidigital number, since it uses as much as digits as its factorization.

12539663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 35.

The square root of 12539663 is about 3541.1386586803. The cubic root of 12539663 is about 232.3246482970.

The spelling of 12539663 in words is "twelve million, five hundred thirty-nine thousand, six hundred sixty-three".