8566981 has 2 divisors, whose sum is σ = 8566982. Its totient is φ = 8566980.

The previous prime is 8566949. The next prime is 8567003. The reversal of 8566981 is 1896658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5085025 + 3481956 = 2255^2 + 1866^2 .

It is a cyclic number.

It is not a de Polignac number, because 8566981 - 2⁵ = 8566949 is a prime.

It is a super-2 number, since 2×8566981² = 146786326908722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8566781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4283490 + 4283491.

It is an arithmetic number, because the mean of its divisors is an integer number (4283491).

Almost surely, 2^8566981 is an apocalyptic number.

It is an amenable number.

8566981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8566981 is an equidigital number, since it uses as much as digits as its factorization.

8566981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 8566981 is about 2926.9405528640. The cubic root of 8566981 is about 204.6174185153.

The spelling of 8566981 in words is "eight million, five hundred sixty-six thousand, nine hundred eighty-one".