987851 has 2 divisors, whose sum is σ = 987852. Its totient is φ = 987850.

The previous prime is 987821. The next prime is 987869. The reversal of 987851 is 158789.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (987821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493925 + 493926.

It is an arithmetic number, because the mean of its divisors is an integer number (493926).

2⁹⁸⁷⁸⁵¹ is an apocalyptic number.

987851 is a deficient number, since it is larger than the sum of its proper divisors (1).

987851 is an equidigital number, since it uses as much as digits as its factorization.

987851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 38.

The square root of 987851 is about 993.9069372934. The cubic root of 987851 is about 99.5933821939.

The spelling of 987851 in words is "nine hundred eighty-seven thousand, eight hundred fifty-one".