8645981 has 2 divisors, whose sum is σ = 8645982. Its totient is φ = 8645980.

The previous prime is 8645971. The next prime is 8646017. The reversal of 8645981 is 1895468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7344100 + 1301881 = 2710^2 + 1141^2 .

It is a cyclic number.

It is not a de Polignac number, because 8645981 - 2¹⁰ = 8644957 is a prime.

It is a super-2 number, since 2×8645981² = 149505974904722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8645941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4322990 + 4322991.

It is an arithmetic number, because the mean of its divisors is an integer number (4322991).

Almost surely, 2^8645981 is an apocalyptic number.

It is an amenable number.

8645981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8645981 is an equidigital number, since it uses as much as digits as its factorization.

8645981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 8645981 is about 2940.4049040906. The cubic root of 8645981 is about 205.2444515970.

The spelling of 8645981 in words is "eight million, six hundred forty-five thousand, nine hundred eighty-one".