345246409 has 2 divisors, whose sum is σ = 345246410. Its totient is φ = 345246408.

The previous prime is 345246401. The next prime is 345246431. The reversal of 345246409 is 904642543.

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., 313290000 + 31956409 = 17700^2 + 5653^2 .

It is a cyclic number.

It is not a de Polignac number, because 345246409 - 2³ = 345246401 is a prime.

It is not a weakly prime, because it can be changed into another prime (345246401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172623204 + 172623205.

It is an arithmetic number, because the mean of its divisors is an integer number (172623205).

Almost surely, 2^345246409 is an apocalyptic number.

It is an amenable number.

345246409 is a deficient number, since it is larger than the sum of its proper divisors (1).

345246409 is an equidigital number, since it uses as much as digits as its factorization.

345246409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 345246409 is about 18580.8075443453. The cubic root of 345246409 is about 701.5248453283.

The spelling of 345246409 in words is "three hundred forty-five million, two hundred forty-six thousand, four hundred nine".