8641987 has 2 divisors, whose sum is σ = 8641988. Its totient is φ = 8641986.

The previous prime is 8641957. The next prime is 8641991. The reversal of 8641987 is 7891468.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8641987 is a prime.

8641987 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8641957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320993 + 4320994.

It is an arithmetic number, because the mean of its divisors is an integer number (4320994).

Almost surely, 2^8641987 is an apocalyptic number.

8641987 is a deficient number, since it is larger than the sum of its proper divisors (1).

8641987 is an equidigital number, since it uses as much as digits as its factorization.

8641987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 8641987 is about 2939.7256674731. The cubic root of 8641987 is about 205.2128425909.

The spelling of 8641987 in words is "eight million, six hundred forty-one thousand, nine hundred eighty-seven".