981887 has 2 divisors, whose sum is σ = 981888. Its totient is φ = 981886.

The previous prime is 981823. The next prime is 981889. The reversal of 981887 is 788189.

It is a strong prime.

It is an emirp because it is prime and its reverse (788189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981887 - 2⁶ = 981823 is a prime.

Together with 981889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490943 + 490944.

It is an arithmetic number, because the mean of its divisors is an integer number (490944).

2⁹⁸¹⁸⁸⁷ is an apocalyptic number.

981887 is a deficient number, since it is larger than the sum of its proper divisors (1).

981887 is an equidigital number, since it uses as much as digits as its factorization.

981887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 41.

The square root of 981887 is about 990.9021142373. The cubic root of 981887 is about 99.3925508603.

The spelling of 981887 in words is "nine hundred eighty-one thousand, eight hundred eighty-seven".