8711981 has 4 divisors (see below), whose sum is σ = 8876412. Its totient is φ = 8547552.

The previous prime is 8711971. The next prime is 8711987. The reversal of 8711981 is 1891178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1891178 = 2 ⋅945589.

It can be written as a sum of positive squares in 2 ways, for example, as 5593225 + 3118756 = 2365^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 8711981 - 2¹⁰ = 8710957 is a prime.

It is a super-2 number, since 2×8711981² = 151797225888722, 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 (8711987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82136 + ... + 82241.

It is an arithmetic number, because the mean of its divisors is an integer number (2219103).

Almost surely, 2^8711981 is an apocalyptic number.

It is an amenable number.

8711981 is a deficient number, since it is larger than the sum of its proper divisors (164431).

8711981 is a wasteful number, since it uses less digits than its factorization.

8711981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164430.

The product of its digits is 4032, while the sum is 35.

The square root of 8711981 is about 2951.6065117153. The cubic root of 8711981 is about 205.7653799773.

The spelling of 8711981 in words is "eight million, seven hundred eleven thousand, nine hundred eighty-one".