342123809 has 2 divisors, whose sum is σ = 342123810. Its totient is φ = 342123808.

The previous prime is 342123791. The next prime is 342123863. The reversal of 342123809 is 908321243.

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., 293779600 + 48344209 = 17140^2 + 6953^2 .

It is an emirp because it is prime and its reverse (908321243) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-342123809 is a prime.

It is a Chen prime.

It is equal to p_18402908 and since 342123809 and 18402908 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (342123889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171061904 + 171061905.

It is an arithmetic number, because the mean of its divisors is an integer number (171061905).

Almost surely, 2^342123809 is an apocalyptic number.

It is an amenable number.

342123809 is a deficient number, since it is larger than the sum of its proper divisors (1).

342123809 is an equidigital number, since it uses as much as digits as its factorization.

342123809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 342123809 is about 18496.5891179969. The cubic root of 342123809 is about 699.4034434455.

The spelling of 342123809 in words is "three hundred forty-two million, one hundred twenty-three thousand, eight hundred nine".