12151987 has 2 divisors, whose sum is σ = 12151988. Its totient is φ = 12151986.

The previous prime is 12151973. The next prime is 12152009. The reversal of 12151987 is 78915121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78915121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12151987 is a prime.

It is not a weakly prime, because it can be changed into another prime (12151927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6075993 + 6075994.

It is an arithmetic number, because the mean of its divisors is an integer number (6075994).

Almost surely, 2^12151987 is an apocalyptic number.

12151987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12151987 is an equidigital number, since it uses as much as digits as its factorization.

12151987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 34.

The square root of 12151987 is about 3485.9700228200. The cubic root of 12151987 is about 229.9053611900.

The spelling of 12151987 in words is "twelve million, one hundred fifty-one thousand, nine hundred eighty-seven".