12887761 has 2 divisors, whose sum is σ = 12887762. Its totient is φ = 12887760.

The previous prime is 12887759. The next prime is 12887767. The reversal of 12887761 is 16778821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11350161 + 1537600 = 3369^2 + 1240^2 .

It is an emirp because it is prime and its reverse (16778821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12887761 - 2¹ = 12887759 is a prime.

Together with 12887759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12887767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6443880 + 6443881.

It is an arithmetic number, because the mean of its divisors is an integer number (6443881).

Almost surely, 2^12887761 is an apocalyptic number.

It is an amenable number.

12887761 is a deficient number, since it is larger than the sum of its proper divisors (1).

12887761 is an equidigital number, since it uses as much as digits as its factorization.

12887761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 40.

The square root of 12887761 is about 3589.9527852048. The cubic root of 12887761 is about 234.4548158617.

The spelling of 12887761 in words is "twelve million, eight hundred eighty-seven thousand, seven hundred sixty-one".