8197981 has 16 divisors (see below), whose sum is σ = 9561600. Its totient is φ = 6955200.

The previous prime is 8197967. The next prime is 8198009. The reversal of 8197981 is 1897918.

It is a cyclic number.

It is not a de Polignac number, because 8197981 - 2¹³ = 8189789 is a prime.

It is a super-2 number, since 2×8197981² = 134413784952722, 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 (8197901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9475 + ... + 10303.

It is an arithmetic number, because the mean of its divisors is an integer number (597600).

Almost surely, 2^8197981 is an apocalyptic number.

It is an amenable number.

8197981 is a deficient number, since it is larger than the sum of its proper divisors (1363619).

8197981 is a wasteful number, since it uses less digits than its factorization.

8197981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900.

The product of its digits is 36288, while the sum is 43.

The square root of 8197981 is about 2863.2116582607. The cubic root of 8197981 is about 201.6364158649.

The spelling of 8197981 in words is "eight million, one hundred ninety-seven thousand, nine hundred eighty-one".