987893281 has 2 divisors, whose sum is σ = 987893282. Its totient is φ = 987893280.

The previous prime is 987893279. The next prime is 987893293. The reversal of 987893281 is 182398789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 841870225 + 146023056 = 29015^2 + 12084^2 .

It is a cyclic number.

It is not a de Polignac number, because 987893281 - 2¹ = 987893279 is a prime.

It is a super-2 number, since 2×987893281² = 1951866269289889922, which contains 22 as substring.

Together with 987893279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (987893261) 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, 493946640 + 493946641.

It is an arithmetic number, because the mean of its divisors is an integer number (493946641).

Almost surely, 2^987893281 is an apocalyptic number.

It is an amenable number.

987893281 is a deficient number, since it is larger than the sum of its proper divisors (1).

987893281 is an equidigital number, since it uses as much as digits as its factorization.

987893281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 55.

The square root of 987893281 is about 31430.7696533190. The cubic root of 987893281 is about 995.9480307207.

The spelling of 987893281 in words is "nine hundred eighty-seven million, eight hundred ninety-three thousand, two hundred eighty-one".