343333721 has 2 divisors, whose sum is σ = 343333722. Its totient is φ = 343333720.

The previous prime is 343333691. The next prime is 343333741. The reversal of 343333721 is 127333343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178596496 + 164737225 = 13364^2 + 12835^2 .

It is an emirp because it is prime and its reverse (127333343) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343333721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (343333741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171666860 + 171666861.

It is an arithmetic number, because the mean of its divisors is an integer number (171666861).

Almost surely, 2^343333721 is an apocalyptic number.

It is an amenable number.

343333721 is a deficient number, since it is larger than the sum of its proper divisors (1).

343333721 is an equidigital number, since it uses as much as digits as its factorization.

343333721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 29.

The square root of 343333721 is about 18529.2666071812. The cubic root of 343333721 is about 700.2269475017.

The spelling of 343333721 in words is "three hundred forty-three million, three hundred thirty-three thousand, seven hundred twenty-one".