345408409 has 2 divisors, whose sum is σ = 345408410. Its totient is φ = 345408408.

The previous prime is 345408407. The next prime is 345408419. The reversal of 345408409 is 904804543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208167184 + 137241225 = 14428^2 + 11715^2 .

It is an emirp because it is prime and its reverse (904804543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345408409 - 2¹ = 345408407 is a prime.

It is a super-2 number, since 2×345408409² = 238613938015822562, which contains 22 as substring.

Together with 345408407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (345408403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172704204 + 172704205.

It is an arithmetic number, because the mean of its divisors is an integer number (172704205).

Almost surely, 2^345408409 is an apocalyptic number.

It is an amenable number.

345408409 is a deficient number, since it is larger than the sum of its proper divisors (1).

345408409 is an equidigital number, since it uses as much as digits as its factorization.

345408409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 345408409 is about 18585.1663699844. The cubic root of 345408409 is about 701.6345536903.

The spelling of 345408409 in words is "three hundred forty-five million, four hundred eight thousand, four hundred nine".