345354209 has 2 divisors, whose sum is σ = 345354210. Its totient is φ = 345354208.

The previous prime is 345354181. The next prime is 345354211. The reversal of 345354209 is 902453543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265787809 + 79566400 = 16303^2 + 8920^2 .

It is an emirp because it is prime and its reverse (902453543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345354209 is a prime.

Together with 345354211, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_18567251 and since 345354209 and 18567251 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 (345354259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172677104 + 172677105.

It is an arithmetic number, because the mean of its divisors is an integer number (172677105).

Almost surely, 2^345354209 is an apocalyptic number.

It is an amenable number.

345354209 is a deficient number, since it is larger than the sum of its proper divisors (1).

345354209 is an equidigital number, since it uses as much as digits as its factorization.

345354209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 345354209 is about 18583.7081606444. The cubic root of 345354209 is about 701.5978526131.

The spelling of 345354209 in words is "three hundred forty-five million, three hundred fifty-four thousand, two hundred nine".