4489981 has 2 divisors, whose sum is σ = 4489982. Its totient is φ = 4489980.

The previous prime is 4489973. The next prime is 4489999. The reversal of 4489981 is 1899844.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3767481 + 722500 = 1941^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 4489981 - 2³ = 4489973 is a prime.

It is a super-2 number, since 2×4489981² = 40319858760722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4489081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2244990 + 2244991.

It is an arithmetic number, because the mean of its divisors is an integer number (2244991).

Almost surely, 2^4489981 is an apocalyptic number.

It is an amenable number.

4489981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4489981 is an equidigital number, since it uses as much as digits as its factorization.

4489981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 43.

The square root of 4489981 is about 2118.9575267098. The cubic root of 4489981 is about 164.9737454400.

The spelling of 4489981 in words is "four million, four hundred eighty-nine thousand, nine hundred eighty-one".