342809809 has 2 divisors, whose sum is σ = 342809810. Its totient is φ = 342809808.

The previous prime is 342809759. The next prime is 342809833. The reversal of 342809809 is 908908243.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294465600 + 48344209 = 17160^2 + 6953^2 .

It is a cyclic number.

It is not a de Polignac number, because 342809809 - 2⁹ = 342809297 is a prime.

It is not a weakly prime, because it can be changed into another prime (342809849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171404904 + 171404905.

It is an arithmetic number, because the mean of its divisors is an integer number (171404905).

Almost surely, 2^342809809 is an apocalyptic number.

It is an amenable number.

342809809 is a deficient number, since it is larger than the sum of its proper divisors (1).

342809809 is an equidigital number, since it uses as much as digits as its factorization.

342809809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 342809809 is about 18515.1237911066. The cubic root of 342809809 is about 699.8705944463.

The spelling of 342809809 in words is "three hundred forty-two million, eight hundred nine thousand, eight hundred nine".