843485009 has 2 divisors, whose sum is σ = 843485010. Its totient is φ = 843485008.

The previous prime is 843484987. The next prime is 843485017. The reversal of 843485009 is 900584348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445083409 + 398401600 = 21097^2 + 19960^2 .

It is a cyclic number.

It is not a de Polignac number, because 843485009 - 2⁸ = 843484753 is a prime.

It is a super-2 number, since 2×843485009² = 1422933920815460162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (843485099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421742504 + 421742505.

It is an arithmetic number, because the mean of its divisors is an integer number (421742505).

Almost surely, 2^843485009 is an apocalyptic number.

It is an amenable number.

843485009 is a deficient number, since it is larger than the sum of its proper divisors (1).

843485009 is an equidigital number, since it uses as much as digits as its factorization.

843485009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 843485009 is about 29042.8133795609. The cubic root of 843485009 is about 944.8418532887.

The spelling of 843485009 in words is "eight hundred forty-three million, four hundred eighty-five thousand, nine".