343065721 has 2 divisors, whose sum is σ = 343065722. Its totient is φ = 343065720.

The previous prime is 343065683. The next prime is 343065727. The reversal of 343065721 is 127560343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230705721 + 112360000 = 15189^2 + 10600^2 .

It is a cyclic number.

It is not a de Polignac number, because 343065721 - 2⁹ = 343065209 is a prime.

It is not a weakly prime, because it can be changed into another prime (343065727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171532860 + 171532861.

It is an arithmetic number, because the mean of its divisors is an integer number (171532861).

Almost surely, 2^343065721 is an apocalyptic number.

It is an amenable number.

343065721 is a deficient number, since it is larger than the sum of its proper divisors (1).

343065721 is an equidigital number, since it uses as much as digits as its factorization.

343065721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 343065721 is about 18522.0333926921. The cubic root of 343065721 is about 700.0447053081.

The spelling of 343065721 in words is "three hundred forty-three million, sixty-five thousand, seven hundred twenty-one".