843342509 has 2 divisors, whose sum is σ = 843342510. Its totient is φ = 843342508.

The previous prime is 843342503. The next prime is 843342527. The reversal of 843342509 is 905243348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542424100 + 300918409 = 23290^2 + 17347^2 .

It is a cyclic number.

It is not a de Polignac number, because 843342509 - 2²⁴ = 826565293 is a prime.

It is a super-2 number, since 2×843342509² = 1422453174972830162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (843342503) 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, 421671254 + 421671255.

It is an arithmetic number, because the mean of its divisors is an integer number (421671255).

Almost surely, 2^843342509 is an apocalyptic number.

It is an amenable number.

843342509 is a deficient number, since it is larger than the sum of its proper divisors (1).

843342509 is an equidigital number, since it uses as much as digits as its factorization.

843342509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 843342509 is about 29040.3600012121. The cubic root of 843342509 is about 944.7886424846.

The spelling of 843342509 in words is "eight hundred forty-three million, three hundred forty-two thousand, five hundred nine".