8361981 has 16 divisors (see below), whose sum is σ = 12438400. Its totient is φ = 5552064.

The previous prime is 8361979. The next prime is 8362021. The reversal of 8361981 is 1891638.

It is not a de Polignac number, because 8361981 - 2¹ = 8361979 is a prime.

It is a super-2 number, since 2×8361981² = 139845452488722, 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 (8361901) 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, 8640 + ... + 9558.

It is an arithmetic number, because the mean of its divisors is an integer number (777400).

Almost surely, 2^8361981 is an apocalyptic number.

It is an amenable number.

8361981 is a deficient number, since it is larger than the sum of its proper divisors (4076419).

8361981 is a wasteful number, since it uses less digits than its factorization.

8361981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265 (or 1259 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 8361981 is about 2891.7090102567. The cubic root of 8361981 is about 202.9721220018.

The spelling of 8361981 in words is "eight million, three hundred sixty-one thousand, nine hundred eighty-one".