8669981 has 2 divisors, whose sum is σ = 8669982. Its totient is φ = 8669980.

The previous prime is 8669963. The next prime is 8669989. The reversal of 8669981 is 1899668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6205081 + 2464900 = 2491^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 8669981 - 2¹⁸ = 8407837 is a prime.

It is a super-2 number, since 2×8669981² = 150337141080722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8669989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334990 + 4334991.

It is an arithmetic number, because the mean of its divisors is an integer number (4334991).

Almost surely, 2^8669981 is an apocalyptic number.

It is an amenable number.

8669981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8669981 is an equidigital number, since it uses as much as digits as its factorization.

8669981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The square root of 8669981 is about 2944.4831464962. The cubic root of 8669981 is about 205.4341858416.

The spelling of 8669981 in words is "eight million, six hundred sixty-nine thousand, nine hundred eighty-one".