987971987 has 2 divisors, whose sum is σ = 987971988. Its totient is φ = 987971986.

The previous prime is 987971951. The next prime is 987972019. The reversal of 987971987 is 789179789.

987971987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 987971987 - 2¹² = 987967891 is a prime.

It is not a weakly prime, because it can be changed into another prime (987971927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493985993 + 493985994.

It is an arithmetic number, because the mean of its divisors is an integer number (493985994).

Almost surely, 2^987971987 is an apocalyptic number.

987971987 is a deficient number, since it is larger than the sum of its proper divisors (1).

987971987 is an equidigital number, since it uses as much as digits as its factorization.

987971987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 65.

The square root of 987971987 is about 31432.0216817182. The cubic root of 987971987 is about 995.9744792604.

The spelling of 987971987 in words is "nine hundred eighty-seven million, nine hundred seventy-one thousand, nine hundred eighty-seven".