8981981 has 2 divisors, whose sum is σ = 8981982. Its totient is φ = 8981980.

The previous prime is 8981977. The next prime is 8981989. The reversal of 8981981 is 1891898.

It is a happy number.

8981981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8357881 + 624100 = 2891^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 8981981 - 2² = 8981977 is a prime.

It is a super-2 number, since 2×8981981² = 161351965368722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8981989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4490990 + 4490991.

It is an arithmetic number, because the mean of its divisors is an integer number (4490991).

Almost surely, 2^8981981 is an apocalyptic number.

It is an amenable number.

8981981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8981981 is an equidigital number, since it uses as much as digits as its factorization.

8981981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 44.

The square root of 8981981 is about 2996.9953286584. The cubic root of 8981981 is about 207.8694709274.

The spelling of 8981981 in words is "eight million, nine hundred eighty-one thousand, nine hundred eighty-one".