987951321 has 24 divisors (see below), whose sum is σ = 1636737024. Its totient is φ = 562524480.

The previous prime is 987951281. The next prime is 987951329. The reversal of 987951321 is 123159789.

It is not a de Polignac number, because 987951321 - 2¹⁰ = 987950297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (987951329) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10201 + ... + 45606.

It is an arithmetic number, because the mean of its divisors is an integer number (68197376).

Almost surely, 2^987951321 is an apocalyptic number.

It is an amenable number.

987951321 is a deficient number, since it is larger than the sum of its proper divisors (648785703).

987951321 is a wasteful number, since it uses less digits than its factorization.

987951321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56101 (or 56098 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 987951321 is about 31431.6929388158. The cubic root of 987951321 is about 995.9675347477.

The spelling of 987951321 in words is "nine hundred eighty-seven million, nine hundred fifty-one thousand, three hundred twenty-one".