343255921 has 2 divisors, whose sum is σ = 343255922. Its totient is φ = 343255920.

The previous prime is 343255909. The next prime is 343255973. The reversal of 343255921 is 129552343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333245025 + 10010896 = 18255^2 + 3164^2 .

It is an emirp because it is prime and its reverse (129552343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343255921 - 2⁵ = 343255889 is a prime.

It is not a weakly prime, because it can be changed into another prime (353255921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171627960 + 171627961.

It is an arithmetic number, because the mean of its divisors is an integer number (171627961).

Almost surely, 2^343255921 is an apocalyptic number.

It is an amenable number.

343255921 is a deficient number, since it is larger than the sum of its proper divisors (1).

343255921 is an equidigital number, since it uses as much as digits as its factorization.

343255921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 343255921 is about 18527.1671067112. The cubic root of 343255921 is about 700.1740526372.

The spelling of 343255921 in words is "three hundred forty-three million, two hundred fifty-five thousand, nine hundred twenty-one".