343405649 has 2 divisors, whose sum is σ = 343405650. Its totient is φ = 343405648.

The previous prime is 343405637. The next prime is 343405679. The reversal of 343405649 is 946504343.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219484225 + 123921424 = 14815^2 + 11132^2 .

It is an emirp because it is prime and its reverse (946504343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343405649 - 2⁴ = 343405633 is a prime.

It is a super-2 number, since 2×343405649² = 235854879530222402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_18468056 and since 343405649 and 18468056 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 (343405609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171702824 + 171702825.

It is an arithmetic number, because the mean of its divisors is an integer number (171702825).

Almost surely, 2^343405649 is an apocalyptic number.

It is an amenable number.

343405649 is a deficient number, since it is larger than the sum of its proper divisors (1).

343405649 is an equidigital number, since it uses as much as digits as its factorization.

343405649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 343405649 is about 18531.2074350270. The cubic root of 343405649 is about 700.2758429873.

The spelling of 343405649 in words is "three hundred forty-three million, four hundred five thousand, six hundred forty-nine".