343520561 has 2 divisors, whose sum is σ = 343520562. Its totient is φ = 343520560.

The previous prime is 343520557. The next prime is 343520563. The reversal of 343520561 is 165025343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300814336 + 42706225 = 17344^2 + 6535^2 .

It is a cyclic number.

It is not a de Polignac number, because 343520561 - 2² = 343520557 is a prime.

Together with 343520563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (343520563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171760280 + 171760281.

It is an arithmetic number, because the mean of its divisors is an integer number (171760281).

Almost surely, 2^343520561 is an apocalyptic number.

It is an amenable number.

343520561 is a deficient number, since it is larger than the sum of its proper divisors (1).

343520561 is an equidigital number, since it uses as much as digits as its factorization.

343520561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 343520561 is about 18534.3076752276. The cubic root of 343520561 is about 700.3539441327.

The spelling of 343520561 in words is "three hundred forty-three million, five hundred twenty thousand, five hundred sixty-one".