12887549 has 2 divisors, whose sum is σ = 12887550. Its totient is φ = 12887548.

The previous prime is 12887519. The next prime is 12887551. The reversal of 12887549 is 94578821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12376324 + 511225 = 3518^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12887549 is a prime.

Together with 12887551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12887509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6443774 + 6443775.

It is an arithmetic number, because the mean of its divisors is an integer number (6443775).

Almost surely, 2^12887549 is an apocalyptic number.

It is an amenable number.

12887549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12887549 is an equidigital number, since it uses as much as digits as its factorization.

12887549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 12887549 is about 3589.9232582327. The cubic root of 12887549 is about 234.4535302830.

The spelling of 12887549 in words is "twelve million, eight hundred eighty-seven thousand, five hundred forty-nine".