12931087987 has 2 divisors, whose sum is σ = 12931087988. Its totient is φ = 12931087986.

The previous prime is 12931087973. The next prime is 12931087993. The reversal of 12931087987 is 78978013921.

It is a strong prime.

It is an emirp because it is prime and its reverse (78978013921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12931087987 - 2¹⁹ = 12930563699 is a prime.

It is not a weakly prime, because it can be changed into another prime (12931087937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6465543993 + 6465543994.

It is an arithmetic number, because the mean of its divisors is an integer number (6465543994).

Almost surely, 2^12931087987 is an apocalyptic number.

12931087987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12931087987 is an equidigital number, since it uses as much as digits as its factorization.

12931087987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 12931087987 in words is "twelve billion, nine hundred thirty-one million, eighty-seven thousand, nine hundred eighty-seven".