443561009 has 2 divisors, whose sum is σ = 443561010. Its totient is φ = 443561008.

The previous prime is 443560973. The next prime is 443561011. The reversal of 443561009 is 900165344.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338560000 + 105001009 = 18400^2 + 10247^2 .

It is a cyclic number.

It is not a de Polignac number, because 443561009 - 2²⁸ = 175125553 is a prime.

Together with 443561011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (443566009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221780504 + 221780505.

It is an arithmetic number, because the mean of its divisors is an integer number (221780505).

Almost surely, 2^443561009 is an apocalyptic number.

It is an amenable number.

443561009 is a deficient number, since it is larger than the sum of its proper divisors (1).

443561009 is an equidigital number, since it uses as much as digits as its factorization.

443561009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 443561009 is about 21060.8881341695. Note that the first 3 decimals coincide. The cubic root of 443561009 is about 762.6368524050.

The spelling of 443561009 in words is "four hundred forty-three million, five hundred sixty-one thousand, nine".