12631987 has 2 divisors, whose sum is σ = 12631988. Its totient is φ = 12631986.

The previous prime is 12631963. The next prime is 12631999. The reversal of 12631987 is 78913621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12631987 is a prime.

It is not a weakly prime, because it can be changed into another prime (12631387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6315993 + 6315994.

It is an arithmetic number, because the mean of its divisors is an integer number (6315994).

Almost surely, 2^12631987 is an apocalyptic number.

12631987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12631987 is an equidigital number, since it uses as much as digits as its factorization.

12631987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 12631987 is about 3554.1506721016. The cubic root of 12631987 is about 232.8934226175.

The spelling of 12631987 in words is "twelve million, six hundred thirty-one thousand, nine hundred eighty-seven".