12887621 has 2 divisors, whose sum is σ = 12887622. Its totient is φ = 12887620.

The previous prime is 12887617. The next prime is 12887627. The reversal of 12887621 is 12678821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 1060900 = 3439^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 12887621 - 2² = 12887617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12887627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6443810 + 6443811.

It is an arithmetic number, because the mean of its divisors is an integer number (6443811).

Almost surely, 2^12887621 is an apocalyptic number.

It is an amenable number.

12887621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12887621 is an equidigital number, since it uses as much as digits as its factorization.

12887621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 35.

The square root of 12887621 is about 3589.9332862882. The cubic root of 12887621 is about 234.4539668962.

The spelling of 12887621 in words is "twelve million, eight hundred eighty-seven thousand, six hundred twenty-one".