9981287 has 8 divisors (see below), whose sum is σ = 10752000. Its totient is φ = 9238680.

The previous prime is 9981271. The next prime is 9981317. The reversal of 9981287 is 7821899.

9981287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9981287 - 2⁴ = 9981271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6287 + ... + 7712.

It is an arithmetic number, because the mean of its divisors is an integer number (1344000).

Almost surely, 2^9981287 is an apocalyptic number.

9981287 is a deficient number, since it is larger than the sum of its proper divisors (770713).

9981287 is a wasteful number, since it uses less digits than its factorization.

9981287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14053.

The product of its digits is 72576, while the sum is 44.

The square root of 9981287 is about 3159.3174895854. The cubic root of 9981287 is about 215.3089986356.

It can be divided in two parts, 998128 and 7, that multiplied together give a palindrome (6986896).

The spelling of 9981287 in words is "nine million, nine hundred eighty-one thousand, two hundred eighty-seven".