343966561 has 2 divisors, whose sum is σ = 343966562. Its totient is φ = 343966560.

The previous prime is 343966523. The next prime is 343966619. The reversal of 343966561 is 165669343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329640336 + 14326225 = 18156^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 343966561 - 2²³ = 335577953 is a prime.

It is equal to p_18496717 and since 343966561 and 18496717 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 (343936561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171983280 + 171983281.

It is an arithmetic number, because the mean of its divisors is an integer number (171983281).

Almost surely, 2^343966561 is an apocalyptic number.

It is an amenable number.

343966561 is a deficient number, since it is larger than the sum of its proper divisors (1).

343966561 is an equidigital number, since it uses as much as digits as its factorization.

343966561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 43.

The square root of 343966561 is about 18546.3355140578. The cubic root of 343966561 is about 700.6569078285.

The spelling of 343966561 in words is "three hundred forty-three million, nine hundred sixty-six thousand, five hundred sixty-one".