981287 has 2 divisors, whose sum is σ = 981288. Its totient is φ = 981286.

The previous prime is 981283. The next prime is 981289. The reversal of 981287 is 782189.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (782189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981287 - 2² = 981283 is a prime.

Together with 981289, 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 (981283) 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, 490643 + 490644.

It is an arithmetic number, because the mean of its divisors is an integer number (490644).

2⁹⁸¹²⁸⁷ is an apocalyptic number.

981287 is a deficient number, since it is larger than the sum of its proper divisors (1).

981287 is an equidigital number, since it uses as much as digits as its factorization.

981287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 981287 is about 990.5993135471. The cubic root of 981287 is about 99.3723015234.

The spelling of 981287 in words is "nine hundred eighty-one thousand, two hundred eighty-seven".