443320981 has 2 divisors, whose sum is σ = 443320982. Its totient is φ = 443320980.

The previous prime is 443320979. The next prime is 443321003. The reversal of 443320981 is 189023344.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427248900 + 16072081 = 20670^2 + 4009^2 .

It is a cyclic number.

It is not a de Polignac number, because 443320981 - 2¹ = 443320979 is a prime.

It is a super-2 number, since 2×443320981² = 393066984389604722, which contains 22 as substring.

Together with 443320979, 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 (443320921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221660490 + 221660491.

It is an arithmetic number, because the mean of its divisors is an integer number (221660491).

Almost surely, 2^443320981 is an apocalyptic number.

It is an amenable number.

443320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

443320981 is an equidigital number, since it uses as much as digits as its factorization.

443320981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 443320981 is about 21055.1889328973. The cubic root of 443320981 is about 762.4992634948.

The spelling of 443320981 in words is "four hundred forty-three million, three hundred twenty thousand, nine hundred eighty-one".