987971 has 2 divisors, whose sum is σ = 987972. Its totient is φ = 987970.

The previous prime is 987941. The next prime is 987979. The reversal of 987971 is 179789.

987971 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 987971 - 2¹⁸ = 725827 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (987979) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493985 + 493986.

It is an arithmetic number, because the mean of its divisors is an integer number (493986).

2⁹⁸⁷⁹⁷¹ is an apocalyptic number.

987971 is a deficient number, since it is larger than the sum of its proper divisors (1).

987971 is an equidigital number, since it uses as much as digits as its factorization.

987971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 41.

The square root of 987971 is about 993.9673032852. The cubic root of 987971 is about 99.5974147595.

The spelling of 987971 in words is "nine hundred eighty-seven thousand, nine hundred seventy-one".