8321981 has 16 divisors (see below), whose sum is σ = 9216000. Its totient is φ = 7484400.

The previous prime is 8321977. The next prime is 8321983. The reversal of 8321981 is 1891238.

It is a cyclic number.

It is not a de Polignac number, because 8321981 - 2² = 8321977 is a prime.

It is a super-2 number, since 2×8321981² = 138510735528722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8321983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41720 + ... + 41918.

It is an arithmetic number, because the mean of its divisors is an integer number (576000).

Almost surely, 2^8321981 is an apocalyptic number.

It is an amenable number.

8321981 is a deficient number, since it is larger than the sum of its proper divisors (894019).

8321981 is a wasteful number, since it uses less digits than its factorization.

8321981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320.

The product of its digits is 3456, while the sum is 32.

The square root of 8321981 is about 2884.7843940232. The cubic root of 8321981 is about 202.6479617697.

The spelling of 8321981 in words is "eight million, three hundred twenty-one thousand, nine hundred eighty-one".