8018981 has 2 divisors, whose sum is σ = 8018982. Its totient is φ = 8018980.

The previous prime is 8018963. The next prime is 8019001. The reversal of 8018981 is 1898108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7480225 + 538756 = 2735^2 + 734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8018981 is a prime.

It is a super-2 number, since 2×8018981² = 128608112556722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8018911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4009490 + 4009491.

It is an arithmetic number, because the mean of its divisors is an integer number (4009491).

Almost surely, 2^8018981 is an apocalyptic number.

It is an amenable number.

8018981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8018981 is an equidigital number, since it uses as much as digits as its factorization.

8018981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 8018981 is about 2831.7805352816. The cubic root of 8018981 is about 200.1580500680.

The spelling of 8018981 in words is "eight million, eighteen thousand, nine hundred eighty-one".