8917981 has 4 divisors (see below), whose sum is σ = 8964864. Its totient is φ = 8871100.

The previous prime is 8917963. The next prime is 8917991. The reversal of 8917981 is 1897198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8917981 - 2⁵ = 8917949 is a prime.

It is a super-2 number, since 2×8917981² = 159060770232722, 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 (8917991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23155 + ... + 23536.

It is an arithmetic number, because the mean of its divisors is an integer number (2241216).

Almost surely, 2^8917981 is an apocalyptic number.

It is an amenable number.

8917981 is a deficient number, since it is larger than the sum of its proper divisors (46883).

8917981 is a wasteful number, since it uses less digits than its factorization.

8917981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46882.

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

The square root of 8917981 is about 2986.2988798846. The cubic root of 8917981 is about 207.3745775162.

The spelling of 8917981 in words is "eight million, nine hundred seventeen thousand, nine hundred eighty-one".