443542009 has 2 divisors, whose sum is σ = 443542010. Its totient is φ = 443542008.

The previous prime is 443542007. The next prime is 443542013. The reversal of 443542009 is 900245344.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421891600 + 21650409 = 20540^2 + 4653^2 .

It is a cyclic number.

It is not a de Polignac number, because 443542009 - 2¹ = 443542007 is a prime.

Together with 443542007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (443542007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221771004 + 221771005.

It is an arithmetic number, because the mean of its divisors is an integer number (221771005).

Almost surely, 2^443542009 is an apocalyptic number.

It is an amenable number.

443542009 is a deficient number, since it is larger than the sum of its proper divisors (1).

443542009 is an equidigital number, since it uses as much as digits as its factorization.

443542009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 443542009 is about 21060.4370562436. The cubic root of 443542009 is about 762.6259630296.

The spelling of 443542009 in words is "four hundred forty-three million, five hundred forty-two thousand, nine".