443842981 has 2 divisors, whose sum is σ = 443842982. Its totient is φ = 443842980.

The previous prime is 443842979. The next prime is 443843011. The reversal of 443842981 is 189248344.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441378081 + 2464900 = 21009^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 443842981 - 2¹ = 443842979 is a prime.

It is a super-2 number, since 2×443842981² = 393993183565932722, which contains 22 as substring.

Together with 443842979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (443842901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221921490 + 221921491.

It is an arithmetic number, because the mean of its divisors is an integer number (221921491).

Almost surely, 2^443842981 is an apocalyptic number.

It is an amenable number.

443842981 is a deficient number, since it is larger than the sum of its proper divisors (1).

443842981 is an equidigital number, since it uses as much as digits as its factorization.

443842981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 43.

The square root of 443842981 is about 21067.5812802514. The cubic root of 443842981 is about 762.7984210752.

The spelling of 443842981 in words is "four hundred forty-three million, eight hundred forty-two thousand, nine hundred eighty-one".